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2 faults documented by at least two sources, listed by version then by mileage at onset when known.
2 known faults
A 12 V battery that drains after a few weeks standing is the fault most often reported on the RX 450h (Who Can Fix My Car), and it is the subject of many owner accounts on Lexus forums. This battery cannot be jump-started: it must be recharged slowly, otherwise the hybrid circuits can be damaged.
A US recall (16V053) covers 2016 RX 350 and RX 450h models built between 16 November and 23 December 2015: a faulty weld may allow gas to escape from the driver's knee airbag. An Australian recall also covers RX 450h models built from late 2015 to early 2016 whose passenger airbag may deploy partially. These campaigns concern specific production batches: have the serial number checked with the Lexus network.
Fixed free of charge by a dealer and not counted in the reliability score: ask for proof the work was done (invoice, or a VIN check at a dealer).
A 12 V battery that drains after a few weeks standing is the fault most often reported on the RX 450h (Who Can Fix My Car), and it is the subject of many owner accounts on Lexus forums. This battery cannot be jump-started: it must be recharged slowly, otherwise the hybrid circuits can be damaged.
A US recall (16V053) covers 2016 RX 350 and RX 450h models built between 16 November and 23 December 2015: a faulty weld may allow gas to escape from the driver's knee airbag. An Australian recall also covers RX 450h models built from late 2015 to early 2016 whose passenger airbag may deploy partially. These campaigns concern specific production batches: have the serial number checked with the Lexus network.
Fixed free of charge by a dealer and not counted in the reliability score: ask for proof the work was done (invoice, or a VIN check at a dealer).
An OBD scanner plugged in under the steering wheel shows stored fault codes, even with warning lights off: useful during the test drive.
Compare prices of parts for the Lexus RX IV (timing, brakes, filters) to estimate the repairs to plan for.