Photo: M 93, CC BY-SA 3.0 de, via Wikimedia Commons
4 faults documented by at least two sources, listed by version then by mileage at onset when known.
4 known faults
The XJ X351 has air springs at the rear only. Typical faults are leaking bellows and a worn compressor, with a rear end that sags (CarChecker). Buying guides advise checking that the car stays level (UseCarScout).
On the 3.0 diesel, clogging of the EGR valve and the DPF is a check point cited when buying (XF Forum); EGR or turbo problems can make DPF regeneration ineffective, up to filter saturation (EURO FAP).
Owners report sunroof problems (Forum Auto Caradisiac); buying guides mention creaking and corrosion of the steel rails, which can lead to a major repair (UseCarScout).
The XJ X351 has air springs at the rear only. Typical faults are leaking bellows and a worn compressor, with a rear end that sags (CarChecker). Buying guides advise checking that the car stays level (UseCarScout).
On the 3.0 diesel, clogging of the EGR valve and the DPF is a check point cited when buying (XF Forum); EGR or turbo problems can make DPF regeneration ineffective, up to filter saturation (EURO FAP).
Owners report sunroof problems (Forum Auto Caradisiac); buying guides mention creaking and corrosion of the steel rails, which can lead to a major repair (UseCarScout).
The XJ X351 has air springs at the rear only. Typical faults are leaking bellows and a worn compressor, with a rear end that sags (CarChecker). Buying guides advise checking that the car stays level (UseCarScout).
Owners report sunroof problems (Forum Auto Caradisiac); buying guides mention creaking and corrosion of the steel rails, which can lead to a major repair (UseCarScout).
On the 5.0 V8 (AJ133), the steel piston of the tensioner wears the aluminium chain guide: the chain loses tension and rattles on cold start, with a risk of the chain jumping in extreme cases (JLR Engines Blog). Owners consider 5.0s built before 2014 the most exposed, and Jaguar reportedly revised the tensioner and guide in March 2014 (UseCarScout). A similar noise can come from the compressor insulation housing on supercharged versions: have the source of the noise confirmed.
The XJ X351 has air springs at the rear only. Typical faults are leaking bellows and a worn compressor, with a rear end that sags (CarChecker). Buying guides advise checking that the car stays level (UseCarScout).
Owners report sunroof problems (Forum Auto Caradisiac); buying guides mention creaking and corrosion of the steel rails, which can lead to a major repair (UseCarScout).
On the 5.0 V8 (AJ133), the steel piston of the tensioner wears the aluminium chain guide: the chain loses tension and rattles on cold start, with a risk of the chain jumping in extreme cases (JLR Engines Blog). Owners consider 5.0s built before 2014 the most exposed, and Jaguar reportedly revised the tensioner and guide in March 2014 (UseCarScout). A similar noise can come from the compressor insulation housing on supercharged versions: have the source of the noise confirmed.
The XJ X351 has air springs at the rear only. Typical faults are leaking bellows and a worn compressor, with a rear end that sags (CarChecker). Buying guides advise checking that the car stays level (UseCarScout).
Owners report sunroof problems (Forum Auto Caradisiac); buying guides mention creaking and corrosion of the steel rails, which can lead to a major repair (UseCarScout).
On the 5.0 V8 (AJ133), the steel piston of the tensioner wears the aluminium chain guide: the chain loses tension and rattles on cold start, with a risk of the chain jumping in extreme cases (JLR Engines Blog). Owners consider 5.0s built before 2014 the most exposed, and Jaguar reportedly revised the tensioner and guide in March 2014 (UseCarScout). A similar noise can come from the compressor insulation housing on supercharged versions: have the source of the noise confirmed.
The XJ X351 has air springs at the rear only. Typical faults are leaking bellows and a worn compressor, with a rear end that sags (CarChecker). Buying guides advise checking that the car stays level (UseCarScout).
Owners report sunroof problems (Forum Auto Caradisiac); buying guides mention creaking and corrosion of the steel rails, which can lead to a major repair (UseCarScout).
An OBD scanner plugged in under the steering wheel shows stored fault codes, even with warning lights off: useful during the test drive.
Compare prices of parts for the Jaguar XJ IV (timing, brakes, filters) to estimate the repairs to plan for.