2006 Lexus RX 3.3L Hybrid electric (clean) · RKZ 2661

On 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.

The 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.

SE-L models fitted with height-adjustable air suspension can develop leaking air struts as the rubber bladders perish. The car drops onto its bump stops overnight, forcing the compressor to run continuously and eventually burn out. Leaving the car parked and checking that no corner drops is the standard buyer check.