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.

What is the 2010-2019 Jaguar XJ X351 Water Pump and Plastic Coolant Pipe Failure Under the Supercharger?

The X351's cooling system fails in a pattern quite unlike the X350's. On the 5.0 V8 and the 3.0 supercharged V6, the water pump seal and bearing can fail remarkably early — owners have reported failures under 20,000 miles — and the small-diameter plastic connectors that plug into… Repairs typically run $900-$2,500. 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 2010-2015 Jaguar XJ AJ133 5.0 V8 Timing Chain Tensioner Ratchet and Plastic Guide Rail Wear?

The 5.0-litre AJ133 V8 fitted to the X351 has a widely documented timing drive weakness that has nothing to do with the earlier 4.2 AJ34's plastic tensioner story — the X350's 4.2 already ran metal tensioners and Morse chains, and merging the two engines' histories is the standar… Repairs typically run $3,500-$9,000. Severity: high.

What is the 2011-2019 Jaguar XJ 306DT 3.0 V6 Diesel Crankshaft and Main Bearing Failure?

The 3.0-litre V6 diesel (306DT / AJ-V6D) sold in the X351 in markets outside North America has a documented bottom-end weakness that is specific to that engine and does not apply to the petrol V6 or either V8. The crankshaft is compact and narrow, leaving thin sections between th… Repairs typically run $6,000-$15,000. 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 2010-2019 Jaguar XJ Supercharger Nose Cone Bearing Wear?

The Eaton TVS supercharger on the XJR and Supersport develops bearing wear in the nose cone assembly. The bearings dry out over time, producing a whining noise that increases with RPM. The coupler between the supercharger and the drive pulley also wears, causing rattle at idle. Repairs typically run $1,200-$3,500. 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 2010-2016 Jaguar XJ Supercharger Torsional Isolator Coupler Backlash ('Marbles in a Can' Rattle) — TSB JTB00349?

A separate component and a separate failure from supercharger nose cone bearing wear: the AJ133 supercharger drive uses a spring-loaded torsional isolator on the blower's nose pulley to damp driveline shock. The end of the original spring bears directly against plastic, and over… Repairs typically run $900-$2,800. 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.

Jaguar · Known Issues

2004-2019 Jaguar XJ Problems: 29 Known Issues

2004-2019 model years · 6,020+ owner reports · Updated September 2026

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According to Au7o's analysis of 6,020+ owner reports, the 2004-2019 Jaguar XJ has 29 documented known issues, with 12 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), X351 Water Pump and Plastic Coolant Pipe Failure Under the Supercharger ($900-$2,500 repair), Restraints Control Module Miscalibration — Airbags Deploy at Wrong Thresholds (Recall 20V-557 / Jaguar H294) ($0-$0 repair), Electronic Parking Brake Module Failure and Stuck-On Park Brake ($300-$1,500 repair), AJ133 5.0 V8 Timing Chain Tensioner Ratchet and Plastic Guide Rail Wear ($3,500-$9,000 repair), 306DT 3.0 V6 Diesel Crankshaft and Main Bearing Failure.

Frequently Asked Questions

What are the most common Jaguar XJ problems?

According to Au7o's analysis of 6,020+ owner reports, the 2004-2019 Jaguar XJ has 29 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, 12 are rated critical and should be addressed promptly.

Is the Jaguar XJ reliable?

The 2004-2019 Jaguar XJ has 29 known issues documented across 6,020+ owner reports. 12 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 X351 Water Pump and Plastic Coolant Pipe Failure Under the Supercharger and Restraints Control Module Miscalibration — Airbags Deploy at Wrong Thresholds (Recall 20V-557 / Jaguar H294) and Electronic Parking Brake Module Failure and Stuck-On Park Brake and AJ133 5.0 V8 Timing Chain Tensioner Ratchet and Plastic Guide Rail Wear and 306DT 3.0 V6 Diesel Crankshaft and Main Bearing Failure and Front Passenger Air Bag Inflator Initiator May Fail to Ignite — Safety Recall 16V943 / Jaguar J080 (2016-2017 XJ) and 276DT 2.7 TDV6 Oil Pump Housing Fracture at the Tensioner Mount and Crankshaft Failure from Oil Starvation (X350 XJ Diesel) and Crankshaft Pulley Centre Bolt Hydrogen Embrittlement Fracture — Safety Recall 19V039 / Jaguar H181 (2019 XJ V6 and V8 Petrol) and TFT Virtual Instrument Cluster Goes Blank Intermittently — Safety Recall 17V678 / Jaguar H056 (2016-2017 XJ). 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 $15,000, 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.

All 29 Known Issues

Other Jaguar Models

Frequently Asked Questions

What are the most common Jaguar XJ problems?

Is the Jaguar XJ reliable?

How much does it cost to fix common Jaguar XJ problems?

What year Jaguar XJ is the most reliable?

AJ133 5.0 V8 Timing Chain Tensioner Ratchet and Plastic Guide Rail Wear#

306DT 3.0 V6 Diesel Crankshaft and Main Bearing Failure#

276DT 2.7 TDV6 Oil Pump Housing Fracture at the Tensioner Mount and Crankshaft Failure from Oil Starvation (X350 XJ Diesel)#

Crankshaft Pulley Centre Bolt Hydrogen Embrittlement Fracture — Safety Recall 19V039 / Jaguar H181 (2019 XJ V6 and V8 Petrol)#

Electronic Throttle Body Failure#

Rear Main Seal Oil Leak on V8 Engines#

Supercharger Nose Cone Bearing Wear#

Supercharger Torsional Isolator Coupler Backlash ('Marbles in a Can' Rattle) — TSB JTB00349#

AJ133 5.0 V8 / AJ126 3.0 SC V6 Engine-Driven Brake Vacuum Pump Seal Oil Leak (X351)#

Plastic Thermostat Housing and Water Pump Impeller Failure on the 4.2 AJ34 V8#

X351 Water Pump and Plastic Coolant Pipe Failure Under the Supercharger#

Underfloor and Rear Crossmember Brake Pipe Corrosion (Recall 09V144 / Jaguar J012)#

Electronic Parking Brake Module Failure and Stuck-On Park Brake#

Restraints Control Module Miscalibration — Airbags Deploy at Wrong Thresholds (Recall 20V-557 / Jaguar H294)#

Front Passenger Air Bag Inflator Initiator May Fail to Ignite — Safety Recall 16V943 / Jaguar J080 (2016-2017 XJ)#

TFT Virtual Instrument Cluster Goes Blank Intermittently — Safety Recall 17V678 / Jaguar H056 (2016-2017 XJ)#

Electrical Gremlins from Body Control Module Issues#

InControl Touch Pro Infotainment Freezing, Black Screen and Spontaneous Reboots (2016-2019 X351 Facelift)#

Air Suspension Compressor Failure#

Front Lower Control Arm Bushing Collapse Causing Front-End Clunk#

Water Ingress into the Boot from Rear Lamp Seals and Blocked Sunroof Drains#

X350 Aluminium Body Filiform/Galvanic Corrosion — Paint Blistering at Boot Lid Edge, Door Bottoms, Wheel Arches and Pillars#

ZF 6HP26 Mechatronic Connector Sleeve and Plastic Sump Pan Fluid Leak#

JaguarDrive Rotary Gear Selector Fails to Rise on Start-Up#

Front Wiper Arm Spindle Nuts Under-Torqued — Arms Lose Synchronisation and Clash / Detach — Recall 10V578 (2010-2011 XJ)#

X351 LED Tail Lamp Condensation and Water Pooling from Failed Housing Seam and Vent Bungs#

Panoramic Roof and Powered Sunblind Motor Failure / Loss of Calibration#

X350 Saddle-Tank Twin Fuel Pump / Jet Pump Failure — Stalling, Hesitation and Erratic Fuel Gauge#

2.7 TDV6 EGR Valve Sticking and Inlet Y-Piece Carbon Blockage Causing Restricted Performance and Turbo Bearing Failure#

What is the 2004-2019 Jaguar XJ Air Suspension Compressor Failure?

What is the 2004-2009 Jaguar XJ Plastic Thermostat Housing and Water Pump Impeller Failure on the 4.2 AJ34 V8?

What is the 2004-2009 Jaguar XJ Underfloor and Rear Crossmember Brake Pipe Corrosion (Recall 09V144 / Jaguar J012)?

What is the 2010-2019 Jaguar XJ X351 Water Pump and Plastic Coolant Pipe Failure Under the Supercharger?

What is the 2010-2017 Jaguar XJ Restraints Control Module Miscalibration — Airbags Deploy at Wrong Thresholds (Recall 20V-557 / Jaguar H294)?

What is the 2004-2009 Jaguar XJ Electronic Parking Brake Module Failure and Stuck-On Park Brake?

What is the 2010-2015 Jaguar XJ AJ133 5.0 V8 Timing Chain Tensioner Ratchet and Plastic Guide Rail Wear?

What is the 2011-2019 Jaguar XJ 306DT 3.0 V6 Diesel Crankshaft and Main Bearing Failure?

What is the 2016-2017 Jaguar XJ Front Passenger Air Bag Inflator Initiator May Fail to Ignite — Safety Recall 16V943 / Jaguar J080 (2016-2017 XJ)?

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)?

What is the 2019 Jaguar XJ Crankshaft Pulley Centre Bolt Hydrogen Embrittlement Fracture — Safety Recall 19V039 / Jaguar H181 (2019 XJ V6 and V8 Petrol)?

What is the 2016-2017 Jaguar XJ TFT Virtual Instrument Cluster Goes Blank Intermittently — Safety Recall 17V678 / Jaguar H056 (2016-2017 XJ)?