CONCERNS: ‍
The 2010-2019 generation generally scores well for reliability, with owners reporting a high level of dependability compared to rivals.

‍Reliability Highlights: According to What Car?, in a 2024 survey, the 2010-2019 XJ was the second most reliable used luxury car, with only 14% of owners reporting issues.

‍Potential Issues: The primary areas of concern can be non-engine electrical systems and the air suspension, which may require maintenance after many years of use. Diesel models require occasional motorway runs to clean the particulate filter

‍Handling: Reviewers note the power-assisted steering is light and responsive, making it comfortable to drive, though the soft suspension leads to some body roll.

‍Reliability & Maintenance: Mechanically, the engines are considered strong if serviced correctly, but the cars can be complex and rust-prone.

COMMON ISSUES
‍Air Compressor Failure: The air suspension compressor has a relatively short service life due to the internal seals wearing out, leading to an "Air Suspension Fault" message and potentially the car riding too low.

‍Worn Bushes and Control Arms: The complex double-wishbone suspension setup can be hard on suspension bushes and control arms (wishbones), which may need replacing every few years.

‍Air Strut Leaks: The air struts themselves can develop leaks over time, requiring replacement.

Coolant Leaks: Plastic components in the cooling system, such as the coolant reservoir and various hoses/pipes, can become brittle and crack over time, leading to coolant loss and potential overheating.

‍Timing Chain Problems: Early models of the 3.0L supercharged V6 and 5.0L V8 engines had a design flaw in the timing chain tensioners and guides. This can cause a rattling sound on cold start and, if ignored, lead to significant engine damage.

‍Water Pump Failure: Water pumps on the V6 and V8 petrol engines are prone to failure because coolant can leak into the bearing housing, corroding the bearing and causing the seal to fail.

‍Diesel Particulate Filters (DPF): Diesel models need regular runs at motorway speeds to clean the DPF. If the car is mainly driven in urban areas, the filter can become clogged, leading to performance issues and warning lights.

‍Crankshaft Failure: The 3.0L V6 diesel engine has a known potential for crankshaft failure, which can be an uneconomical repair.

CONCERNS: ‍
The XJS is praised as a magnificent grand tourer, offering a smooth and quiet ride with a powerful engine sound when pushed. It was designed for comfort and luxury rather than a nimble sports car experience like its predecessor, the E-Type.

‍Handling: Reviewers note the power-assisted steering is light and responsive, making it surprisingly comfortable to drive, though the soft suspension leads to some body roll.

‍Reliability & Maintenance: Mechanically, the engines are considered strong if serviced correctly, but the cars can be complex and rust-prone.

COMMON ISSUES
‍Cooling System: The V12 engine requires the coolant to be replaced every two years with quality antifreeze, as the radiator can silt up quickly.
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‍Suspension/Chassis: Bushes, bearings, and ball joints wear due to the car's substantial weight.
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‍Electrics: Troublesome electrics are a potential issue, so all components like windows, aerial, and warning lights should be checked thoroughly.
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‍Rust: Buyers should inspect for rot around the scuttle and sills.

CONCERNS: ‍
When properly maintained, the S-Type can be a reliable modern classic, but it is known for certain common issues that prospective buyers should be aware of.

‍Electrical Faults: Issues with the electronic parking brake servos, central locking mechanisms, and the air conditioning system have been reported.

‍Engine & Cooling: Common engine problems include oil leaks (especially from valve cover gaskets), overheating due to faulty thermostats or water pumps, and timing chain tensioner failures in V6 and V8 petrol engines.

‍Corrosion: Rust can form in less visible areas such as behind the plastic sill panels and in the boot floor if seals fail, so a thorough inspection is crucial when buying a used model.

CONCERNS: ‍
The modern Jaguar XK is generally considered reliable for a luxury sports car, with many specific issues being manageable with proper maintenance.
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‍Timing chain tensioners: Early first-generation (X100) models had known weaknesses with timing chain tensioners; buyers should ensure these have been upgraded.

‍Overheating: Thermostat failures and radiators clogged with leaves can lead to overheating issues, especially in 5.0L V8 models.

‍Gearbox oil: Though transmissions are often described as "sealed for life," specialists recommend changing the oil and filter every 60,000 miles to prevent issues.

‍Body and Electronics
‍Aluminum bodywork: While resistant to rust, repairing dents or poorly repaired damage on the aluminum body requires specialist skills and can be costly.

‍Pedestrian Contact Sensing Bonnet System: The safety system that raises the bonnet in a collision can occasionally deploy without cause due to sensor faults.

‍Electrical issues: Minor electrical faults can often arise from a drained battery; a quality battery maintainer/trickle charger is a sensible precaution, especially if the car is left unused for periods.