2006 Lexus RX400 3.3L Petrol · RN55 AGV

The Lexus RX400’s most recent MOT history demonstrates a stable roadworthiness trend, though the December 2025 test cycle reveals a rare anomaly. The vehicle passed its final test on 20 December 2025 at 140,366 miles, yet the preceding day’s test at 140,361 miles resulted in a failure—despite no defects being recorded. This unusual back-to-back outcome suggests either a minor administrative oversight or a last-minute adjustment before the final inspection. Beyond this, the four preceding annual tests (2022–2024) all passed without fail, indicating consistent compliance with MOT standards during that period. The absence of advisories or recurring faults in the record implies no systematic neglect of critical components, though the lack of defects does not preclude hidden wear. The mileage progression of 140,366 miles over 20 years reflects an average of approximately 7,000 miles annually, which aligns with typical usage for a vehicle of this age. There are no significant gaps or spikes in the recorded mileage, as each annual test spans roughly 2,500–3,500 miles between tests, suggesting steady, moderate use without prolonged periods of inactivity or aggressive driving. The consistency in mileage intervals also implies that the vehicle has likely been maintained in a manner that avoids extreme wear patterns, though this does not guarantee all underlying components remain in pristine condition. Given the lack of recorded defects or advisories, a prospective buyer should prioritise an independent inspection of high-wear areas that often exceed MOT thresholds. The suspension—particularly the rear coil springs and bushes—should be examined for fatigue or corrosion, as these components are prone to deterioration over 20 years. Front and rear brake calipers and discs warrant close scrutiny for uneven wear or binding, especially if the vehicle has experienced hard braking or off-road use. Additionally, the subframe and wheel arches should be inspected for structural corrosion, as Lexus models from this era are susceptible to rust progression in these areas. Tyre condition, while not flagged in MOTs, should be verified, as the absence of tread-related failures does not rule out uneven wear or low tread depth. Finally, the exhaust system and emissions components should be checked for leaks or corrosion, as these are common failure points in older vehicles.