Photo: Dinkun Chen, CC BY-SA 4.0, via Wikimedia Commons
2 faults documented by at least two sources, listed by version then by mileage at onset when known.
2 known faults
An owner of a GS 300h reports a car that would no longer start after seven months standing at the seller's, the 12 V battery being charged at almost €700 by Lexus (Caradisiac). A thread in an owners' club also covers battery discharge on the fourth-generation GS. Prolonged immobilisation or short journeys should therefore be watched.
In March 2015 Lexus launched a Limited Service Campaign on certain 2013 model-year GS 350 and GS 450h: the passenger seat sensors, which control activation of the passenger airbag and help detect certain collisions, could misread seat occupancy (NHTSA bulletins, US market). Check with Lexus France whether the vehicle is affected.
An owner of a GS 300h reports a car that would no longer start after seven months standing at the seller's, the 12 V battery being charged at almost €700 by Lexus (Caradisiac). A thread in an owners' club also covers battery discharge on the fourth-generation GS. Prolonged immobilisation or short journeys should therefore be watched.
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 GS IV (timing, brakes, filters) to estimate the repairs to plan for.