Lexus RX (XU30)
The second-generation Lexus RX (XU30) transformed the premium SUV landscape in the UK when it launched in May 2003. Initially offered as the RX 300 with a smooth 3.0-litre 1MZ-FE V6 petrol engine, the lineup truly made history in 2005 with the debut of the RX 400h. Pairing a 3.3-litre 3MZ-FE V6 with front and rear electric motors (E-Four hybrid all-wheel drive), the 400h was the world first luxury hybrid SUV. In Britain, it became an instant hit among affluent suburban families and London commuters seeking exemption from the London Congestion Charge without sacrificing leather-lined luxury. In 2006, the conventional petrol engine was upgraded to the chain-driven 3.5-litre 2GR-FE V6 in the RX 350. Across all variants, the XU30 prioritised whisper-quiet refinement, supple ride comfort, and impeccable cabin materials over aggressive off-roading. On the UK used market today, surviving examples remain remarkably durable workhorses, though prospective buyers must scrutinise hybrid inverter condition, air suspension struts on SE-L models, and radiator integrity to avoid heavy repair bills.
Check a specific car?
Got a registration for a RX (XU30)? Get an instant MOT and history report.
Common Faults & Reliability
These are the most common documented problems for the Lexus RX (XU30), sorted by their typical impact and frequency.
Hybrid Inverter Intelligent Power Module (IPM) Solder Fatigue
high severityOn RX 400h models, the solder joints on the transistors within the Intelligent Power Module (IPM) of the hybrid inverter can fail under thermal cycling. This triggers the Check Hybrid System warning, illuminates master warning lamps, and forces the vehicle into limp-home mode or causes an immediate loss of motive power. While covered by major UK safety recalls (DVSA recalls R/2011/076 and R/2013/088), unserviced or second-hand replacement inverters can still fail if the inverter cooling system is degraded.
Radiator End-Tank Seam Splitting and Coolant Loss
medium severityThe original Denso radiators fitted to the XU30 series suffer from age-related embrittlement of the plastic side/bottom end tanks and crimped aluminium core seams. In the UK climate, repeated thermal cycling and road salt spray accelerate corrosion along the bottom core channel, leading to slow weeping of Toyota Super Long Life pink coolant. If left unnoticed, the gradual loss of coolant can cause severe engine overheating and cylinder head gasket failure on the 3.0, 3.3, and 3.5-litre V6 engines.
Browse by Production Year
Select a specific year to view detailed registration directory lookup and annual MOT history reports for the Lexus RX (XU30).