Jaguar XK problems, reliability and years to avoid
If you are considering buying a used Jaguar XK, these are the common problems worth knowing about first. Our garage database tracks 10 known faults for this model, 4 of them rated high severity. Every one below is a repair bill a seller has good reason not to mention.
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Is the Jaguar XK reliable?
The Jaguar XK has 10 known faults in our database across 2 generations, 4 of them rated high severity. The most serious are fuel system (the direct-injection 5.0 V8 has lost injectors at low mileages) and engine (a small number of early V8 engines suffered Nikasil bore coating failure after 50,000). None of them makes the car a bad buy on its own; the risk is a seller who knows and says nothing.
That is a count of the faults we hold, not a reliability score. Popular cars get written about more, and a newer generation has had less time to show its faults.
Which Jaguar XK years should you avoid?
No year is a write-off on its own. What matters is which serious faults a given year and engine can have, and whether the car in front of you has had them fixed.
X100, 1996 to 20063 high severity
7 known faults, the serious ones in the engine
X150, 2006 to 20151 high severity
3 known faults, the serious ones in the fuel system
Years and engines with a serious known fault
2009 to 2015, 5.0 V8 petrol, naturally aspirated and supercharged (XK and XKR): the direct-injection 5.0 V8 has lost injectors at low mileages
1996 to 2000, V8 built before September 2000: 4.0 (S-Type, XJ8, supercharged XJR) and 3.2 (XJ8): a small number of early V8 engines suffered Nikasil bore coating failure after
1996 to 2006, 4.0 and 4.2 AJ-V8 petrol, XK8 and XKR: the AJ-V8's timing chain tensioners have failed and taken the chains with them
1996 to 2000, 4.0 AJ-V8 petrol built before September 2000 (Nikasil bore coating): the Nikasil bore coating on 1996 to 1999 model-year V8s was eroded
Each one is set out in full below, with the symptoms, the typical mileage and a rough repair cost.
Generation 1 of 27 known faults · 1 owner report · 1 good note
Jaguar XK X100 (1996 to 2006) problems
Engine/EmissionsHigh severity📝 Editorial
A small number of early V8 engines suffered Nikasil bore coating failure after 50,000 to 60,000 miles, losing compression. Jaguar replaced affected engines if the car was under five years old, had covered less than 100,000 miles and had a full Jaguar service history, cover that has long since run out. Engines built from September 2000 are not affected.
Typical symptoms
lumpy, uneven running
hard starting
loss of power from falling compression
Affected vehicles
Engines:
V8 built before September 2000: 4.0 (S-Type, XJ8, supercharged XJR) and 3.2 (XJ8)
Typical mileage:
50000-60000 miles
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Engine/EmissionsMedium severity📝 Editorial
The V8 engines have had problems with their timing chain tensioners, which shows up as a noisy timing chain. On the 1997 to 2003 XJ8 and XJR the original plastic tensioners could crack and let the chain jump, which can wreck the engine; later tensioners were revised with metal parts.
Typical symptoms
clatter from the timing chain end, worst straight after a cold start
chain noise that quietens once oil pressure builds
Affected vehicles
Engines:
4.0 and 4.2 V8 (S-Type); 3.2 and 4.0 V8 (XJ8 and supercharged XJR, X308)
Typical mileage:
unknown miles
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Engine/EmissionsHigh severity📝 Editorial
The AJ-V8's timing chain tensioners have failed and taken the chains with them, and the warning is a rattle from the chains before the tensioner lets go; a defective tensioner was apparently also the subject of a recall. The original plastic tensioners were later replaced by steel ones, which can be fitted to earlier cars, so a car with the steel tensioners fitted has had the known fix. The same engines in the S-Type and XJ8 share the problem.
Rough guide
£1200-2500 for tensioners and chains, far more after a failure
Typical symptoms
rattle from the front of the engine on a cold start
chain noise at idle that changes with revs
engine running rough or stopping after a tensioner fails
Affected vehicles
Engines:
4.0 and 4.2 AJ-V8 petrol, XK8 and XKR
Typical mileage:
60000-120000 miles
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Engine/EmissionsHigh severity📝 Editorial
The Nikasil bore coating on 1996 to 1999 model-year V8s was eroded by the sulphur in the petrol of the time, losing compression, and cars from those years can carry residual damage from before the sulphur content of UK petrol was cut in mid 2000. Engines built from September 2000, including replacement engines, have cast iron liners and are not affected. A lumpy-feeling engine is the sign, and a replaced engine carries a tag on the nearside of the block. The same fault is on record for the S-Type and XJ8.
Rough guide
£3000-6000
Typical symptoms
poor starting and rough idle when cold
loss of power and high oil consumption
low or uneven compression across cylinders
Affected vehicles
Engines:
4.0 AJ-V8 petrol built before September 2000 (Nikasil bore coating)
Typical mileage:
50000-100000 miles
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SuspensionMedium severity📝 Editorial
On the X308 XJ8 and XJR and on the 1996 to 2006 XK8 and XKR, the front wishbone bushes can wear out after as little as about 20,000 miles. Worn bushes upset the steering and wear the tyres unevenly, and if they are ignored other suspension parts can be damaged. Replacing them can run to about £700.
Rough guide
£700
Typical symptoms
Steering that feels vague or not quite right
Front tyres wearing unevenly
Affected vehicles
Engines:
All engines
Typical mileage:
20000 miles
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Bodywork/ChassisMedium severity📝 Editorial
The footwells of the 1996 to 2006 XK8 and XKR can rust badly. It has been noted on 2003 cars in particular, and other years of this model may be affected too. No repair cost is recorded.
Typical symptoms
Rust under the footwell carpets
Soft or flaking metal in the footwell floor
Affected vehicles
Engines:
All engines
Typical mileage:
unknown miles
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Bodywork/ChassisMedium severity📝 Editorial
Water in the footwell of a 1996 to 2006 XK can come from a pinched air conditioning drain. There is so little room around it that the transmission has to come out before it can be put right.
Typical symptoms
Water collecting under the footwell carpet
Carpet getting wet after the air conditioning has been running
Affected vehicles
Engines:
All engines
Typical mileage:
unknown miles
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What owners report on the X100
1 single report, unconfirmed
One owner each, in their own words rewritten as a line, and not counted in our risk scoring. A fault joins the list above once a second report or an editorial source backs it.
Gearbox and clutch · June 2014A 2003 XKR with 16,500 miles experienced intermittent transmission lever issues, not moving from Park, despite a replacement modem and further diagnosis.
What owners like about the X100
1 note
This model achieved a high ranking, placing 30th out of 137 cars in a 2003 Top Gear survey.
Generation 2 of 23 known faults · 11 owner reports · 4 good notes
Jaguar XK X150 (2006 to 2015) problems
Fuel SystemHigh severity💬 3 owner reports, 2016 to 2020
The direct-injection 5.0 V8 has lost injectors at low mileages: a 2010 XKR's injectors failed at 22,974 miles at 70 mph on a car regularly serviced by a Jaguar dealer, with a £5,000 bill for all eight; a 2014 car misfired at 27,000 miles with four of its eight injectors failed, and the dealer quoted £3,000 to replace all eight and warned of possible damage to the catalytic converters; and a 2011 convertible at 40,000 miles had a catastrophic fuel injection failure that also damaged both catalytic converters.
Rough guide
£3000-5000 for a set of eight injectors, more if the catalytic converters are damaged
Typical symptoms
misfire, often at steady motorway speed
engine warning light with injector or misfire codes and restricted performance
rough idle and a smell of unburnt fuel
Affected vehicles
Engines:
5.0 V8 petrol, naturally aspirated and supercharged (XK and XKR)
Typical mileage:
20000-45000 miles
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ElectricalMedium severity💬 3 owner reports, 2012 to 2015
The centre touchscreen and the instrument cluster screen fail: a 22,000-mile 2006 XK 4.2 lost its whole instrument cluster screen, quoted £1,600 to repair with Jaguar paying half, and a 30,000-mile car's touchscreen failed, quoted £800 for an exchange screen or £1,200 for a new one plus £400 to fit (£1,400 in the end with VAT). Flat batteries are another recurring complaint; they can be caused by the electric handbrake not being fully applied, the interior light delay, or the Bluetooth searching for a paired phone when the car has not been double locked.
Rough guide
£800-1600
Typical symptoms
touchscreen blank, unresponsive or ghost-touching
instrument cluster display dark or partly missing
repeated flat batteries
Affected vehicles
Engines:
All
Typical mileage:
20000-40000 miles
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Bodywork/ChassisMedium severity💬 2 owner reports, 2011 to 2019
Water in the passenger footwell comes from the air-conditioning condenser drain, either pinched or with its rubber duckbill rusted or broken off. The part is about £20, but access is so tight that one report said it cannot be put right without removing the transmission, and a Jaguar dealer put the labour for dismantling the dashboard to reach it on an XKR 4.2 at £1,400.
Rough guide
£20 for the part, up to 1400 with dealer labour
Typical symptoms
wet passenger footwell, worse after using the air conditioning
musty smell and misted windows
water sloshing behind the dashboard
Affected vehicles
Engines:
All
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What owners report on the X150
11 single reports, unconfirmed
One owner each, in their own words rewritten as a line, and not counted in our risk scoring. A fault joins the list above once a second report or an editorial source backs it.
Electrics · July 2019A 2007 XKR displayed a persistent 'Check Pedestrian Safety' warning, possibly triggered by a speed hump, requiring an SRS reset.
Engine · June 2019A 2010 XK 5.0 V8 at 101,000 miles developed a timing chain issue due to worn tensioners, leading to a £4,300 repair quote.
Bodywork · March 2019A Jaguar XKR 4.2 Supercharged had water leaking into the passenger footwell from a rusted air conditioning condenser drain.
Electrics · December 2018A 2006 XK displayed a warning light for headlights and offside indicators, traced to a failed earth connection.
Engine · May 2017A regularly serviced 2014 XKR entered limp mode during an overtake, possibly as a protective measure against overfuelling.
Electrics · June 2015A 2013 XKR with 26,000 miles had recurrent media system problems, freezing and losing sound, despite software updates and module replacement.
Electrics · June 2014A 30,000 mile XK experienced touch screen failure, with a final repair bill of £1,400 for an exchange screen and labour.
Bodywork · June 2014A 2006 XK8 convertible had three roof operation failures, each requiring a reset and a battery replacement.
Exhaust · March 2013A 2007 XKR required new catalytic converters at 48,000 miles, incurring a repair cost of £1,600.
Electrics · June 2012A 2006 XK 4.2 with 22,000 miles suffered total instrument cluster screen failure; Jaguar contributed half of the £1,600 repair cost.
Gearbox and clutch · February 2011A 2007 XKR needed a new supercharger drivebelt after three years and 22,000 miles, followed by differential failure.
What owners like about the X150
4 notes
The car features understated yet purposeful styling, contributing to its overall aesthetic appeal.
The supercharged V8 engine delivers stunning performance, providing an exhilarating driving experience.
This model is remarkably quick yet maintains a high level of refinement, offering a balanced driving experience.
The XKR-S variant elevates the car's performance and capabilities to an entirely new level.
Sellers rarely admit these faults outright
We track 25 specific phrases sellers use in adverts to soft-pedal these exact issues. Paste any Jaguar XK advert and we check it in seconds.
Repair costs are typical UK ranges, not quotes. Actual cost depends on condition and garage.Data last verified: November 2026
Jaguar XK buying questions
What are the most common Jaguar XK problems?
Three stand out. Fuel system: the direct-injection 5.0 V8 has lost injectors at low mileages (typically 20000 to 45000 miles). Engine: a small number of early V8 engines suffered Nikasil bore coating failure after 50,000 to 60,000 (typically 50000 to 60000 miles). Engine: the AJ-V8's timing chain tensioners have failed and taken the chains with them (typically 60000 to 120000 miles). The full list above is grouped by generation, with typical mileage and a rough repair cost for each.
Which Jaguar XK years should I avoid?
No Jaguar XK year is a write-off, but the X150 (2006 to 2015) carries the most serious faults: fuel system. The X100 (1996 to 2006) has high-severity faults on record too. Year matters less than whether the specific car has had the known fixes, so check the history for them.
What should I check when viewing a used Jaguar XK?
Ask the seller about the fuel system and engine faults on this page and whether they have been fixed, with invoices. On the test drive watch for misfire, often at steady motorway speed, lumpy, uneven running and rattle from the front of the engine on a cold start. Read the MOT history for repeat advisories, then paste the advert into the free check, which reads it against all 10 known faults before you travel. Check a Jaguar XK advert →
What is the real MPG of a Jaguar XK?
Owners report 24.3 mpg on average across the Jaguar XK engines with data, about 99% of the official combined figure. The gap between official and real-world economy varies a lot by engine, so the Real MPG page lists every engine and generation separately, from 82 owner submissions. Jaguar XK Real MPG by engine →
If you used to check the Honest John “Good & Bad” section before the site closed in 2026, this page is where that information now lives. We rebuilt the Jaguar XK owner-report history from the archived Honest John dataset, added our own research, specialist and owner-club sources and DVSA recall data, and we keep it free. Each fault above is badged with its source. The same data feeds our free advert check, which reads a listing against every known fault for the exact engine and year.