According to Au7o's analysis of 6,020+ owner reports, the 2004-2019 Jaguar XJ has 5 documented known issues, with 1 rated critical. The most serious is Air Suspension Compressor Failure ($1,000-$3,000 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 $200 to $3,500. DIY maintenance guides at au7o.io.
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.
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
Community reported
820 owners
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.
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
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.
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…
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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
650 owners
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.
Replace the supercharger nose cone bearing assembly and snout coupler. This can be done on-car by removing the supercharger lid. Use OEM JLR bearings or a specialist rebuild kit. Change the supercharger oil during reassembly.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
47 mm TVS1900 supercharger snout/case rebuild kit
OEM47MM-AJ133-TVS1900-KIT
Confirmed 47 mm isolator and snout/inlet-bearing failure after opening and measuring the XJ TVS1900 Fitment/availability: Listed for 2010-2014 electronically actuated 5.0L TVS1900 units and 2015-2016 only if physical inspection confirms …
49 mm genuine Eaton TVS1900 supercharger rebuild kit
OEM49MM-AJ133-TVS1900-EATON-KIT
Confirmed 49 mm isolator and snout/inlet-bearing failure after inspection of the later XJ TVS1900 Fitment/availability: Listed for later 2017-2019 5.0L supercharged units and transitional engines only after measuring 49 mm.
High Confidence650 owner reportsLast reported by owners Oct 2025Reviewed Mar 2026
Community reported
1,600 owners
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.
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
NHTSA Recalls7 recalls
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.
Campaign #17V67800026/10/2017
AIR BAGS:FRONTAL
Jaguar Land Rover North America, LLC (Jaguar) is recalling certain 2010-2011 and 2017 XJ vehicles. The Restraint Control Module (RCM) software may cause the frontal air bags to deploy improperly in the event of a frontal impact crash.
Campaign #20V55700012/09/2020
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
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."
According to Au7o's analysis of 6,020+ owner reports, the 2004-2019 Jaguar XJ has 5 documented issues. The most frequently reported are: Air Suspension Compressor Failure, Electrical Gremlins from Body Control Module Issues, Electronic Throttle Body Failure. Of these, 1 is rated critical and should be addressed promptly.
Is the Jaguar XJ reliable?
The 2004-2019 Jaguar XJ has 5 known issues documented across 6,020+ owner reports. 1 issue is rated critical: Air Suspension Compressor Failure. 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 $200 to $3,500, 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 year Jaguar XJ is the most reliable?
Reliability varies across model years of the Jaguar XJ. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2004-2019 Jaguar XJ with 5 documented issues documented across 6,020+ owner reports.
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 2004-2012 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.
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.
