2009 Lexus RX400H 3.3L Electric · LL58 SYS

A seventeen-year-old hybrid SUV with three recorded failures across four test cycles presents a mixed but not catastrophic mechanical picture. The most recent outcome on 19 March 2026 was a pass immediately following a same-day failure for an inoperative registration plate lamp, a trivial electrical item that was clearly rectified during the visit. More substantive is the August 2025 cycle, where the engine management warning lamp was flagged as indicating a malfunction before the vehicle was returned the same day with a clean pass, suggesting either a transient emissions or sensor issue rather than a persistent fault. The 2023 test is the most revealing, with a major failure on the offside front anti-roll bar linkage ball joint dust cover, a component-level defect that points to wear in the front suspension geometry rather than a one-off electrical or emissions issue. The advisory trail shows a nearside rear tyre showing perishing in 2023 and light oil misting on the nearside front shock absorber in 2022, both minor items but consistent with a vehicle now entering the age range where rubber and sealing components begin to deteriorate regardless of mileage. With 91,480 miles recorded over seventeen years, this RX400h has covered roughly 5,381 miles annually, a notably low accumulation rate that places it well below the typical 8,000 to 10,000 miles per year expected of a family SUV. The testing history shows annual MOT entries from 2022 through 2026, indicating continuous road use and no extended periods off the road. While low annual mileage reduces wear on high-stress components such as the clutch, brakes and internal engine bearings, it brings its own considerations for a hybrid of this age. Hybrid system components, particularly the high-voltage battery pack and inverter coolant pump, are time-sensitive rather than purely mileage-sensitive, and a vehicle that has done relatively few miles per year over a long period can present age-related degradation in these areas regardless of the odometer reading. The current odometer reading should be verified against the V5C to confirm the recorded figure is correct, as mileage discrepancies are not uncommon in vehicles of this age. For a prospective buyer, the front anti-roll bar linkage flagged in 2023 warrants particular attention, as the replacement of the dust cover alone may not have addressed underlying wear in the ball joint itself. On a test drive, listen for clonking or knocking noises from the front suspension over speed humps, rough tarmac and during slow-speed direction changes, as a worn ball joint will often produce audible feedback well before any handling deterioration becomes apparent. The nearside front shock absorber with light oil misting in 2022 should also be monitored; press down firmly on each front corner and release, observing whether the vehicle rebounds smoothly once or continues to oscillate, and listen for any whining or hissing from the damper body that would indicate seal failure has progressed beyond light misting. The nearside rear tyre perishing advisory means the rubber compound is ageing, and any tyres fitted at the time of purchase should be checked for sidewall cracking, tread depth and manufacture date, as perished tyres represent an immediate safety concern. The 2025 engine MIL warning lamp episode should be investigated before purchase by checking whether any diagnostic trouble codes were stored and whether the catalytic converter, oxygen sensors, or hybrid system have been subsequently inspected. The Lexus RX400h is known for EGR system carbon build-up and occasional inverter cooling faults at this age, and a scan with an appropriate OBD tool would confirm whether the warning lamp has been genuinely resolved or is likely to recur. Given the combination of a recurring minor suspension defect, an engine management episode and the natural age-related deterioration of hybrid components, this vehicle warrants a pre-purchase inspection by a hybrid-capable specialist rather than a generalist garage, with particular emphasis on the high-voltage battery state of health, the front suspension geometry and a compression test on the 3.3-litre V6 petrol engine. The MOT history does not establish the vehicle's overall mechanical soundness, but it does identify the specific components most likely to require attention in the near term.