2003 — 2007
4.2L Supercharged V8 - XJR
Petrol
While accelerating gently from a standstill, feel for any hesitation or 'shudder' in the transmission; this can sometimes point to a torque converter that may eventually need a fluid flush or service.
Cycling through the air suspension modes if available and leaving the vehicle parked overnight; if it sits lower in one corner by morning, it may suggest the air bellows are reaching the end of their service life.
Keep the audio off and listen for any clunking noises over uneven road surfaces; the front suspension bushings and control arms are hardworking components that may require attention in older examples.
Testing all electronic features, specifically the touch-screen interface and seat adjustment motors, as the electrical system on these models can occasionally be sensitive to battery voltage health.
Usually marks the point where secondary cooling system components, like the coolant reservoir or thermostat housing, should be checked for signs of age-related brittleness.
A common window where the timing chain tensioners—while much improved over earlier XJ models—should be inspected to ensure the engine remains at peak reliability.
A stage where the original catalytic converters may show signs of wear, potentially triggering a dashboard warning light if they are no longer operating within factory efficiency parameters.
Prioritise a full transmission fluid and filter change, even if it feels smooth, to keep that complex gearbox shifting precisely.
Keep a close eye on the supercharger belt condition; replacing this preventatively helps maintain that effortless V8 power.
Check the battery voltage regularly; the X350’s sophisticated electronics perform best when fed a consistent, strong charge.
Ensure the coolant system is refreshed every few years to keep the aluminium engine block running at its ideal temperature.
Keep the drain channels around the sunroof and cabin air intake clear of debris to protect the interior electronics from moisture.
Estimated repair costs if issues arise
If this component needs attention in the future, the estimated cost in NZ is reflective of the specialised parts required to maintain the XJR's signature ride quality.
Depending on the car's history, you might eventually need to budget for a preventative transmission service to ensure the ZF gearbox remains smooth and responsive for many more kilometres.
To keep the performance snappy, it is common to consider replacing the supercharger coolant pump if the intake air temperatures begin to rise unexpectedly.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer