According to Au7o's analysis of 5,370+ owner reports, the 2006 Jaguar XJ has 14 documented known issues, with 5 rated critical. The most serious are Air Suspension Compressor Failure ($1,000-$3,000 repair), Plastic Thermostat Housing and Water Pump Impeller Failure on the 4.2 AJ34 V8 ($600-$1,800 repair), Underfloor and Rear Crossmember Brake Pipe Corrosion (Recall 09V144 / Jaguar J012) ($0-$900 repair), Electronic Parking Brake Module Failure and Stuck-On Park Brake ($300-$1,500 repair) and 276DT 2.7 TDV6 Oil Pump Housing Fracture at the Tensioner Mount and Crankshaft Failure from Oil Starvation (X350 XJ Diesel) ($4,000-$9,000 repair). The most commonly reported issue is Air Suspension Compressor Failure with 2,200 owner reports. Across all issues with published estimates, repair costs range from $150 to $9,000. DIY maintenance guides at au7o.io.
ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS
Jaguar Land Rover North America, LLC (Jaguar) is recalling certain 2019 Jaguar F-Pace, F-Type, and XJ vehicles equipped with V6 or V8 gasoline engines. The crankshaft pulley retaining bolt may have been improperly manufactured, possibly causing the crankshaft pulley bolt to fracture, potentially resulting in engine failure.
Campaign #19V03900017/01/2019
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Jaguar Land Rover North America, LLC (Jaguar) is recalling certain model year 2016-2017 Jaguar XJ vehicles manufactured September 12, 2016, to October 26, 2016. The affected vehicles have a front passenger air bag inflator initiator that may fail to ignite during a crash, preventing the air bag from deploying.
Campaign #16V94300029/12/2016
ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
Jaguar Land Rover North America, LLC (Jaguar) is recalling certain 2017-2018 Jaguar XF and F-Pace, 2016-2017 Jaguar XJ and 2018 Jaguar XE vehicles. The instrument cluster (IC) may intermittently go blank.
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According to Au7o's analysis of 5,370+ owner reports, the 2006 Jaguar XJ has 14 documented issues. The most frequently reported are: Air Suspension Compressor Failure, Plastic Thermostat Housing and Water Pump Impeller Failure on the 4.2 AJ34 V8, Underfloor and Rear Crossmember Brake Pipe Corrosion (Recall 09V144 / Jaguar J012). Of these, 5 are rated critical and should be addressed promptly.
Is the Jaguar XJ reliable?
The 2006 Jaguar XJ has 14 known issues documented across 5,370+ owner reports. 5 issues are rated critical: Air Suspension Compressor Failure and Plastic Thermostat Housing and Water Pump Impeller Failure on the 4.2 AJ34 V8 and Underfloor and Rear Crossmember Brake Pipe Corrosion (Recall 09V144 / Jaguar J012) and Electronic Parking Brake Module Failure and Stuck-On Park Brake and 276DT 2.7 TDV6 Oil Pump Housing Fracture at the Tensioner Mount and Crankshaft Failure from Oil Starvation (X350 XJ Diesel). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Jaguar XJ problems?
Repair costs for known Jaguar XJ issues range from $0 to $9,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Air Suspension Compressor Failure, typically costs $1,000-$3,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2004-2019 Jaguar XJ Air Suspension Compressor Failure?
The Dunlop or Hitachi air suspension compressor on the XJ fails due to overwork from leaking air springs or aging valve blocks. The compressor runs continuously, overheats, and eventually burns out. This is one of the most common and expensive repairs on the XJ. Repairs typically run $1,000-$3,000. Severity: high.
What is the 2004-2009 Jaguar XJ Plastic Thermostat Housing and Water Pump Impeller Failure on the 4.2 AJ34 V8?
The naturally aspirated and supercharged 4.2-litre AJ34 V8 in the X350/X358 carries an unusually large amount of load-bearing plastic in the cooling system. The thermostat housing is plastic and its internal support fractures, which lets coolant recirculate through the engine whi… Repairs typically run $600-$1,800. Severity: high.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
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On the 2004-2009 Jaguar XJ, an NVH pad fitted to the underfloor undertray of early X350 XJ sedans traps road salt and moisture against the steel brake pipes running under the floor and over the rear crossmember. The pipes corrode from the outside in and eventually lose mechanical integrity. Because the X350 uses a diagonally split dual circuit, a single pipe failure gives long pedal travel and reduced braking in one circuit; if both circuits lose integrity, service braking is lost entirely. Jaguar issued a voluntary safety recall covering 14,493 US vehicles built at Brown's Lane between 2 January 2003 and 19 January 2004. This is a corrosion-driven failure that keeps appearing on unrepaired salt-belt cars long after the recall window, and on later X350/X358 cars that were never in scope.
Common Symptoms
Brake warning lamp on with 'Fluid Level Low' message in the instrument cluster
Brake pedal travels much farther than normal before the car slows
Reduced braking performance / car pulls under braking
Brake fluid reservoir repeatedly low with no visible caliper leak
Wet or crusty rust visible on hard lines under the floorpan or at the rear crossmember
How to Fix
A free recall remedy exists for in-scope 2004 cars: the dealer removes and discards the NVH pad from the underfloor undertray, inspects the underfloor and rear crossmember brake pipes for red-rust corrosion, and replaces any pipe or union showing red rust. Verify the recall was performed by VIN at nhtsa.gov before buying. On out-of-scope or already-remedied cars, the correct repair is to replace the corroded pipe sections with cupronickel line, which does not rust, and to remove the moisture-trapping NVH pad while the undertray is down.
On the 2004-2009 Jaguar XJ, the X350/X358 replaced the mechanical handbrake with an electric park brake driven by a module mounted in the boot, behind the right-hand trim panel ahead of the wheel arch. Two failure paths dominate. The module itself is in a location that sees moisture from the well-documented boot water leaks on this car, and it corrodes. Separately, the system requires a service-mode retract and a recalibration whenever the rear calipers are opened; a rear pad job done without that procedure leaves the actuators out of position and sets a permanent fault. The failure mode owners fear most is the brake seizing applied, which immobilises the car — it cannot be released by pulling a lever, because there isn't one.
Common Symptoms
'Park Brake Fault' message in the instrument cluster
Park brake will not release, immobilising the car
Park brake will not apply, or applies only intermittently
Whirring or grinding from the rear when the park brake switch is operated
Fault appears immediately after a rear brake pad replacement
Fault appears after a flat or weak battery
How to Fix
Load-test the battery, scan and recalibrate first; if the module is corroded, repair the water ingress before a VIN-specific replacement. No bare module link is approved.
On the 2005-2009 Jaguar XJ 2.7 TDV6 (276DT), the 2.7-litre twin-turbo TDV6 (Ford/PSA-derived 276DT) fitted to the 2005-2009 X350/X358 XJ diesel has two linked bottom-end weaknesses distinct from the later 3.0 306DT story. The oil pump housing has a thin section where the rear timing-belt tensioner mounts; it cracks under load, the pump loses drive or pressure, and the engine is starved of oil. Separately, the crankshaft itself has weak sections between the rod journals and counterweights and can snap, usually after spun main/big-end bearings; forum threads document failures at 45-65k miles on otherwise maintained cars. Diesel dilution of the oil (the engine even carries an oil-dilution warning), extended oil-change intervals, and the rear-mounted belt that often never gets changed all contribute. Failure is usually terminal: a bare replacement engine is the normal repair.
Common Symptoms
Low oil pressure warning
Knocking or rumbling from the bottom end
Sudden engine stop with no restart
Oil dilution warning on the message centre
Metal in drained oil
How to Fix
No recall. Preventive: change oil every 5-6k miles with the correct spec, do not overfill (dilution raises the level), and replace BOTH the front auxiliary belt and the rear oil-pump/fuel-pump drive belt on schedule, fitting the later reinforced oil pump when the rear belt is done. Once the bottom end knocks or the oil light comes on, the fix is a rebuilt engine with an uprated oil pump and new crank, or a replacement engine.
On the 2004-2009 Jaguar XJ, this page previously presented one 2004-2009 electronic-throttle-body failure pattern as established fact. The audited official material does not verify that broad cause or model-year scope. It does show a direct safety conflict: NHTSA manufacturer-communication record 10017595 identifies Jaguar bulletin XJ303-10 for the 2004 XJ as “Electronic Throttle Body - Cleaning Prohibited.” Treat throttle symptoms as a reason for model-year-specific diagnosis, not proof that the throttle body needs cleaning or replacement.
Common Symptoms
How to Fix
Do not follow this page’s former throttle-body cleaning procedure. For a 2004 XJ, Jaguar bulletin XJ303-10 explicitly prohibits electronic throttle-body cleaning. For any model year listed here, have a Jaguar-qualified technician read the stored faults and follow the VIN- and model-year-specific service information before servicing or replacing the assembly. Do not replace the throttle body solely from the symptoms formerly listed on this page.
Low ConfidenceVerified820 owner reportsLast reported by owners Aug 2025Reviewed Aug 2026
Community reported
750 owners
On the 2004-2019 Jaguar XJ, the rear crankshaft main seal on AJ-V8 engines in the XJ develops a slow oil leak over time. The leak worsens as the seal hardens and the crankshaft seal surface develops minor wear grooves. Oil drips onto the transmission bellhousing and can contaminate the clutch on manual models.
Common Symptoms
Oil leak at transmission-to-engine junction
Oil drips visible on ground at rear of engine
Oil smell after driving
Low oil level between changes
Oil on transmission bellhousing
How to Fix
Replace the rear main crankshaft seal. This requires transmission removal for access. Use the updated two-piece seal if available. Inspect the crankshaft seal surface for grooves and install a Speedi-Sleeve if wear is present.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Corteco AJ83744 rear crankshaft seal for the 4.2L X350/X358 branch
OEMAJ83744
Dye-confirmed rear crankshaft seal leak on a 2004-2009 XJ8/XJR 4.2L Fitment/availability: Corteco AJ83744 is listed as the rear crankshaft seal for 2004-2009 Jaguar XJ8. Confirm VIN/engine and installation tooling; it is not the 5.0L int…
Elring rear crankshaft seal with cover for the 5.0L X351 branch
OEMW0133-1892213 / AJ812159 / 948.040
Dye-confirmed rear crankshaft seal/retainer leak on a 2010-2019 XJ 5.0L Fitment/availability: Elring W0133-1892213 includes the cover and is explicitly listed for 2010-2019 XJ 5.0L, corresponding to the AJ812159/948.040 retainer-seal fam…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
TipIf the leak is minor (less than a drip per day), monitor it rather than immediately replacing. The repair cost is high due to transmission removal. Replace it when the transmission is out for other service.
Medium Confidence750 owner reportsLast reported by owners Sep 2025Reviewed Mar 2026
Community reported
2,200 owners
On the 2004-2019 Jaguar XJ, the Dunlop or Hitachi air suspension compressor on the XJ fails due to overwork from leaking air springs or aging valve blocks. The compressor runs continuously, overheats, and eventually burns out. This is one of the most common and expensive repairs on the XJ.
Common Symptoms
Vehicle sitting low on one or all corners
Suspension fault warning on dashboard
Compressor running audibly and continuously
Unable to change ride height
Bouncy ride quality
How to Fix
Replace the air suspension compressor. Inspect all four air springs for leaks and replace any that are cracked or deflated. Check the valve block for internal leaks. Consider an Arnott or AMK aftermarket compressor for improved reliability.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Arnott P-3299 air-suspension compressor for X350/X358
OEMP-3299
Confirmed weak/open/overcurrent compressor on a leak-corrected 2004-2009 XJ X350/X358 Fitment/availability: Arnott P-3299 is exclusively listed for 2004-2009 XJ X350/X358 and includes bracket, intake hose, connector and dryer.
Confirmed weak/open/overcurrent compressor on a leak-corrected 2010-2019 XJ X351 Fitment/availability: Arnott P-3244 is designed specifically for 2010-2019 Jaguar XJ/XJR/XJR575 X351 applications. Confirm VIN and OE interchange, repair le…
High Confidence2,200 owner reportsLast reported by owners Jan 2026Reviewed Mar 2026
On the 2004-2009 Jaguar XJ, the X350/X358 uses aluminium front lower control arms with pressed-in rubber bushings that were not originally available as a separate service part. The rubber delaminates from its inner sleeve and the arm develops fore-aft play, producing a clunk over bumps and when the suspension is loaded in corners. Because the aluminium body and double-wishbone front end are otherwise well regarded, owners often misdiagnose the noise as a ball joint, a sway bar link, or — expensively — as an air suspension fault. Untreated, the play walks the front alignment out and eats front tyres on the inner edge. Owners commonly report the bushings gone by 65,000-100,000 miles, well ahead of the ball joints in the same arm.
Common Symptoms
Clunk or knock from the front end over bumps and expansion joints
Clunk that gets louder when cornering with the suspension loaded
Vague or wandering steering on the highway
Uneven inner-edge wear on the front tyres
Shudder felt through the steering wheel under braking
How to Fix
Inspect bushings and ball joints, replace arms in axle pairs where required, then perform a four-wheel alignment.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Jaguar X350 front lower control arm C2P24861/C2P24862
Select left or right on the page and order the matching axle-pair branches; confirm VIN/chassis before purchase.
On the 2004-2009 Jaguar XJ, the naturally aspirated and supercharged 4.2-litre AJ34 V8 in the X350/X358 carries an unusually large amount of load-bearing plastic in the cooling system. The thermostat housing is plastic and its internal support fractures, which lets coolant recirculate through the engine while bypassing the radiator — the car overheats even though the coolant level and the pump are fine, which sends people chasing head gaskets. Separately, the water pump uses a composite impeller that erodes and shreds, and the plastic retaining ring holding the pump's O-ring crumbles at the bottom of the pump. Additional chronic weep points are the overflow nipple on the coolant expansion tank and the two heater hoses that run beneath the intake manifold. This is a distinct problem from the X351's water pump failures — different engine family, different parts.
Common Symptoms
Temperature gauge climbing above normal, particularly at highway speed
Overheating with a full coolant reservoir and no visible external leak
Coolant puddle or crust at the front of the engine below the pump
Sweet coolant smell after a drive
Heater blowing cold or inconsistent cabin heat
Coolant level warning message
How to Fix
Replace the thermostat housing and metal-impeller water pump branch, inspect the expansion tank and under-manifold hoses, then refill and bleed with the correct coolant.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
Jaguar AJ89485 thermostat housing with thermostat, sensor and seals
XJ X350/X358 3.5L and naturally aspirated 4.2L through VIN G49700; explicitly not for the 4.2L supercharged engine.
On the 2004-2009 Jaguar XJ, x350/X358 cars leak water into the cabin and boot by two separate and frequently confused routes. In the boot, water runs down the boot aperture and gets behind the black plastic strips at each rear lamp cluster; the rear vent seals behind the rear bumper below the lamps also fail. The boot floor then pools water, soaking the carpet and, critically, the modules Jaguar located back there — the electronic park brake module and the rear electronics. Separately, the sunroof drains run down the A-pillars and clog with pollen and debris; when they block, water backs up into the headliner and drops into the front footwells onto more electronics. Both routes explain a large share of this car's reputation for unexplained electrical faults: the electrical symptom is downstream of a water problem.
Common Symptoms
Wet or standing water in the boot floor well
Damp carpet in the front footwells
Musty or mildew smell in the cabin
Water dripping from the headliner near the A-pillar
Multiple unrelated electrical faults appearing after heavy rain
Corroded connectors on boot-mounted modules
How to Fix
Water-test each ingress path separately, clear drains with low-pressure methods, dry the boot and inspect modules. No universal seal or drain product safely covers the diagnosis branches.
On the 2004-2009 Jaguar XJ, the 2004-2009 X350/X358 XJ was Jaguar's first all-aluminium monocoque, yet it is notoriously prone to paint blistering. Steel particles from the panel presses trapped in the aluminium sheet before painting, plus galvanic action where dissimilar-metal fixings and trapped salt water meet the aluminium, cause filiform (worm-like) corrosion under the paint. Owners report it first on the leading edge of the boot lid near the rear screen, then door bottoms, wheel-arch lips, bonnet edges and the A/B/C pillars. Jaguar's corrosion warranty (6 years UK, 10 years US) covered some cars, but many owners were refused once out of warranty even though the blistering clearly started earlier. It is cosmetic rather than structural, but it is expensive to repair correctly because aluminium panels must be stripped back, treated and repainted.
Common Symptoms
Paint blisters or bubbles on the boot lid leading edge below the rear window
Blistering along door bottoms and wheel-arch lips
White powdery aluminium oxide under lifted paint
Bubbling on A/B/C pillars and bonnet edges
How to Fix
No recall. Within the perforation/corrosion warranty period Jaguar repainted or replaced affected panels; out of warranty the fix is a bodyshop strip-and-repaint of each affected panel with proper aluminium etch primer, or replacement of the boot lid/doors. Rinse road salt from the boot-lid seal and door bottoms and inspect annually; touch up chips immediately because corrosion propagates from any break in the paint.
On the 2004-2012 Jaguar XJ, the XJ suffers from cascading electrical faults caused by body control module (BCM) software glitches and CAN bus communication errors. Phantom warning lights, inoperative features, and intermittent failures across multiple systems are common, especially after battery disconnection or jump-starting.
Common Symptoms
Multiple random warning lights illuminated
Windows or sunroof operating on their own
Central locking malfunction
Instrument cluster errors
Intermittent failure of various electrical accessories
How to Fix
Have the BCM reprogrammed with the latest JLR software at a dealer. Check all ground connections for corrosion, especially the main chassis ground behind the engine. Replace the 12V battery with a genuine Jaguar-spec AGM battery. Avoid jump-starting without a proper battery management system.
Owner tips & cautions
TipAlways maintain the 12V battery in good condition. A weak battery is the #1 cause of BCM glitches on the XJ. Use a battery tender if the car sits for more than a week.
Medium Confidence1,600 owner reportsLast reported by owners Nov 2025Reviewed Mar 2026
On the 2004-2009 Jaguar XJ, the X350's ZF 6HP26 six-speed automatic passes its transmission control module wiring through a plastic connector sleeve in the side of the case, and uses a plastic oil pan with an integrated filter. Both parts are heat-cycled by transmission fluid for their whole service life and both eventually harden and leak — the sleeve at its seal, the pan at the gasket face or through fatigue cracks. The leak is deceptive: with the car parked, fluid level sits below the sleeve, so nothing drips until fluid migrates back to the sump over several days, which is why owners chase phantom drips. Jaguar's original 'sealed for life, no dipstick' fluid policy means most cars reach this point on original fluid, which compounds the problem with harsh or delayed shifting. Fluid wicking up the sleeve into the loom can also reach the TCM connector and produce electrical shift faults.
Common Symptoms
Reddish fluid drips or wet film on the transmission case and pan seam
Fluid stains that appear only after the car has sat for several days
Harsh, delayed, or flaring 1-2 and 2-3 shifts
Transmission fault or limp-home mode with reduced gear availability
Burnt smell from the transmission area
How to Fix
Replace the connector sleeve and pan/filter/gasket together, then fill and level-set at the specified temperature with ZF Lifeguard 6. Confirm transmission code before ordering.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
ZF 6HP26 transmission filter/pan service kit for Jaguar X350
Page options include the filter kit and a seven-liter ZF Lifeguard 6 branch; verify that the selected option includes the fluid and separately add the mechatronic sleeve if it is not included.
On the 2004-2009 Jaguar XJ, the 2004-2009 X350/X358 uses a saddle-shaped fuel tank straddling the driveshaft, with a lift pump on one side and a venturi jet pump transferring fuel from the other. When the jet pump or the lift pump module degrades, the engine side of the tank runs dry even though the gauge shows fuel: owners report momentary stutters or stalls at highway speed, hard starts in cold weather, and gauges that drop suddenly or read unreliably because the level senders are built into the non-serviceable pump modules. It affects the V8 and V6 petrol cars and the 2.7 diesel. The pump module is a sealed unit so the sender is replaced with the pump.
Common Symptoms
Momentary stumble or stall at highway speed
Extended cranking on cold starts
Fuel gauge drops suddenly or reads wrong
Stalling with a quarter tank showing
How to Fix
No recall. Check the fuel filter and fuel pressure first; if pressure drops under load or the fault follows fuel level, replace the in-tank pump module(s). Specialists recommend replacing both modules together since the sender units come with them. Aftermarket Bosch pump inserts are used by some owners to cut cost. Access is through the rear seat.
On the 2005-2009 Jaguar XJ 2.7 TDV6 (276DT), on the 2005-2009 X350 XJ 2.7 diesel the twin EGR valves and the plastic inlet 'Y-piece' clog with soot. A valve stuck open feeds carbon back into the intake, restricts airflow and triggers 'Restricted Performance' limp mode; a valve stuck or leaking oil has been linked by owners and specialists to turbocharger bearing failure, and a replacement turbo will fail again if the EGR is not fixed at the same time. Threads on the XJ, XF and Discovery 3/Range Rover Sport (same engine) all document the same pattern.
Common Symptoms
'Restricted Performance' message and limp mode
Black smoke and loss of power under load
Rough idle after warm-up
Whining turbo or blue smoke after EGR fault
How to Fix
No recall. Clean or replace the EGR valves (both banks) and the inlet Y-piece, clear the intake of carbon, and check the turbo for shaft play before returning the car to service. Some owners fit EGR blanking kits (not road-legal in all markets). Expect roughly $400-1,200 for EGR work; add $1,500-3,000 if a turbo has already been damaged.
Jaguar Land Rover North America, LLC (Jaguar) is recalling certain model year 2015 Jaguar XJ vehicles manufactured July 2, 2014, to December 4, 2014. The affected vehicles may have an incorrect description of the operation of Occupant Sensor System (OSS) in the owner's manual. Since the manual does not correspond with the actual Air Bag Status Indicator Lamp, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 208, "Occupant Crash Protection."
Campaign #15V03700027/01/2015
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS
Jaguar Land Rover North America (Jaguar) is recalling certain model year 2014-2015 Jaguar XJ vehicles manufactured February 6, 2014, to July 23, 2014. In the affected vehicles, the brake line junctions under the vehicle may leak brake fluid.
What is the 2004-2009 Jaguar XJ Underfloor and Rear Crossmember Brake Pipe Corrosion (Recall 09V144 / Jaguar J012)?
An NVH pad fitted to the underfloor undertray of early X350 XJ sedans traps road salt and moisture against the steel brake pipes running under the floor and over the rear crossmember. The pipes corrode from the outside in and eventually lose mechanical integrity. Because the X350… Repairs typically run $0-$900. Severity: high.
What is the 2004-2009 Jaguar XJ Electronic Parking Brake Module Failure and Stuck-On Park Brake?
The X350/X358 replaced the mechanical handbrake with an electric park brake driven by a module mounted in the boot, behind the right-hand trim panel ahead of the wheel arch. Two failure paths dominate. The module itself is in a location that sees moisture from the well-documented… Repairs typically run $300-$1,500. Severity: high.
What is the 2005-2009 Jaguar XJ 276DT 2.7 TDV6 Oil Pump Housing Fracture at the Tensioner Mount and Crankshaft Failure from Oil Starvation (X350 XJ Diesel)?
The 2.7-litre twin-turbo TDV6 (Ford/PSA-derived 276DT) fitted to the 2005-2009 X350/X358 XJ diesel has two linked bottom-end weaknesses distinct from the later 3.0 306DT story. The oil pump housing has a thin section where the rear timing-belt tensioner mounts; it cracks under lo… Repairs typically run $4,000-$9,000. Severity: high.
What is the 2004-2012 Jaguar XJ Electrical Gremlins from Body Control Module Issues?
The XJ suffers from cascading electrical faults caused by body control module (BCM) software glitches and CAN bus communication errors. Phantom warning lights, inoperative features, and intermittent failures across multiple systems are common, especially after battery disconnecti… Repairs typically run $200-$1,500. Severity: medium.
What is the 2004-2009 Jaguar XJ Electronic Throttle Body Failure?
This page previously presented one 2004-2009 electronic-throttle-body failure pattern as established fact. The audited official material does not verify that broad cause or model-year scope. It does show a direct safety conflict: NHTSA manufacturer-communication record 10017595 i… Severity: medium.
What is the 2004-2019 Jaguar XJ Rear Main Seal Oil Leak on V8 Engines?
The rear crankshaft main seal on AJ-V8 engines in the XJ develops a slow oil leak over time. The leak worsens as the seal hardens and the crankshaft seal surface develops minor wear grooves. Oil drips onto the transmission bellhousing and can contaminate the clutch on manual mode… Repairs typically run $800-$2,000. Severity: medium.
What is the 2004-2009 Jaguar XJ Water Ingress into the Boot from Rear Lamp Seals and Blocked Sunroof Drains?
X350/X358 cars leak water into the cabin and boot by two separate and frequently confused routes. In the boot, water runs down the boot aperture and gets behind the black plastic strips at each rear lamp cluster; the rear vent seals behind the rear bumper below the lamps also fai… Repairs typically run $150-$900. Severity: medium.
What is the 2004-2009 Jaguar XJ Front Lower Control Arm Bushing Collapse Causing Front-End Clunk?
The X350/X358 uses aluminium front lower control arms with pressed-in rubber bushings that were not originally available as a separate service part. The rubber delaminates from its inner sleeve and the arm develops fore-aft play, producing a clunk over bumps and when the suspensi… Repairs typically run $400-$1,400. Severity: medium.
What is the 2004-2009 Jaguar XJ ZF 6HP26 Mechatronic Connector Sleeve and Plastic Sump Pan Fluid Leak?
The X350's ZF 6HP26 six-speed automatic passes its transmission control module wiring through a plastic connector sleeve in the side of the case, and uses a plastic oil pan with an integrated filter. Both parts are heat-cycled by transmission fluid for their whole service life an… Repairs typically run $450-$1,200. Severity: medium.
What is the 2004-2009 Jaguar XJ X350 Saddle-Tank Twin Fuel Pump / Jet Pump Failure — Stalling, Hesitation and Erratic Fuel Gauge?
The 2004-2009 X350/X358 uses a saddle-shaped fuel tank straddling the driveshaft, with a lift pump on one side and a venturi jet pump transferring fuel from the other. When the jet pump or the lift pump module degrades, the engine side of the tank runs dry even though the gauge s… Repairs typically run $400-$1,500. Severity: medium.
What is the 2004-2009 Jaguar XJ X350 Aluminium Body Filiform/Galvanic Corrosion — Paint Blistering at Boot Lid Edge, Door Bottoms, Wheel Arches and Pillars?
The 2004-2009 X350/X358 XJ was Jaguar's first all-aluminium monocoque, yet it is notoriously prone to paint blistering. Steel particles from the panel presses trapped in the aluminium sheet before painting, plus galvanic action where dissimilar-metal fixings and trapped salt wate… Repairs typically run $500-$4,000. Severity: medium.
What is the 2005-2009 Jaguar XJ 2.7 TDV6 EGR Valve Sticking and Inlet Y-Piece Carbon Blockage Causing Restricted Performance and Turbo Bearing Failure?
On the 2005-2009 X350 XJ 2.7 diesel the twin EGR valves and the plastic inlet 'Y-piece' clog with soot. A valve stuck open feeds carbon back into the intake, restricts airflow and triggers 'Restricted Performance' limp mode; a valve stuck or leaking oil has been linked by owners… Repairs typically run $400-$3,000. Severity: medium.
