1998-2020 Lexus GS Problems: 14 Known Issues

The fuel delivery pipe (fuel rail) on 2007-2011 GS 350 and GS 450h models with the 2GR-FSE 3.5L V6 carries pulsation dampers whose rubber diaphragms harden with age and heat cycling. Once hardened, the diaphragm cracks and gasoline leaks from the damper on top of the engine. A fuel leak in the engine bay in the presence of an ignition source is a fire risk. The same defect covered 2006-2013 IS 350 and 2010-2014 IS 350C - it follows the 2GR-FSE's high-pressure direct-injection fuel rail hardware, so it does not apply to the S160 GS 300/400/430 or to the 2013-2020 L10 cars. Because the failure is age-driven rather than mileage-driven, low-mileage garage-kept cars are not exempt.

The L10 generation GS uses a Denso in-tank low-pressure fuel pump whose impeller was molded from a resin with too little density. The impeller absorbs fuel, swells, and interferes with the surrounding pump body until the pump stops turning. The failure shows first as a rough-running engine and warning lights, then as a stall - and at highway speed a stall raises crash risk. Recovery is often impossible: the car will not restart. This is the same Denso pump defect that grew into one of the largest Toyota recall campaigns ever, and the GS was pulled in over several expansions: 20V012000 covered 2013-2015 and 2018-2019 GS 350 and 2018-2019 GS 300, 20V682000 covered 2017 GS 200t / 2017-2019 GS 350 / 2019 GS 300, and a 2026 recall (26V222000) covered 2015-2022 RC, 2016-2020 GS and 2022 IS vehicles. It is an L10-only issue; the S160 and S190 cars use different pump hardware.

Early S190 cars (2006-2007 GS) were built with aluminum fuel delivery pipes. Ethanol-blended gasoline with low moisture content attacks the internal surface of the aluminum rail. The corrosion progresses until it eats a pinhole through the pipe wall, at which point gasoline leaks under pressure - a fire risk. Before the pinhole forms, corrosion products can plug the injectors, causing a rough idle and/or illuminating the engine warning lamp. Toyota recalled roughly 214,570 vehicles across 2006-2008 Lexus IS, 2006-2007 GS and 2007-2008 LS. This is a generation-specific hardware issue on the first two model years of the S190 body only; later S190 cars got revised rails, and the separate 18V432 pulsation-damper campaign is a different defect on the same family of parts.

On 2007-2011 GS 350 vehicles with the 2GR-FSE V6 built 19 June 2006 through 12 July 2011, the bolts that secure the housing and the sprocket of the variable valve timing gear assembly can loosen. The loosening is driven by abnormal impacts generated inside the gear assembly right after a cold start, when oil pressure to the VVT unit has not yet built. If the bolts back out far enough the VVT gear housing and sprocket separate, valve timing is lost and the engine stops while the car is being driven. This is not the rubber VVT-i oil supply hose failure that swept the 2GR-FE family (Camry/Avalon/RAV4/ES 350/RX 350). The GS 350's 2GR-FSE uses metal VVT-i oil lines from the factory and is not part of that hose campaign - the GS 350's VVT problem is this bolt/gear-assembly defect instead.

Valve springs installed in certain 2007-2008 GS 350 / GS 450h and 2008 GS 460 engines were contaminated during manufacturing with micro foreign objects in the spring wire. The contamination creates a stress riser; over time the spring develops a crack and can break outright. A broken valve spring drops the valve out of control, producing immediate ticking/knocking and rough running, and in the worst case the engine fails and stops suddenly while the car is moving. This affected both the 2GR-FSE V6 (GS 350 / GS 450h) and the 1UR-FSE V8 (GS 460) built in the same period - it is a supplier/material defect, not a design fault of one engine, which is why it spans two different engine families. It does NOT apply to the S160 (1998-2005) cars or to the 2013-2020 L10 generation.

The second-generation S160 GS (1998-2005) develops age-related oil leaks at three related points on all the engines sold in the body - the 2JZ-GE inline six, the 1UZ-FE V8 of the GS 400 and the 3UZ-FE V8 of the GS 430. The valve cover gaskets harden and weep, the camshaft seals behind the timing covers leak, and the VVT-i cam gear O-ring leaks oil that then collects inside the timing belt cover where it is invisible from outside. ClubLexus owners repeatedly report chasing an apparent valve-cover leak only to find the real source is the cam or VVT-i gear seal further in. The distinction matters: an oil-soaked timing belt on the 1UZ-FE, 3UZ-FE and 2JZ-GE - all interference designs on a belt, not a chain - degrades the belt and turns a $30 gasket into catastrophic valve-to-piston contact. Owners also note that over-tightening the valve covers or tightening them out of sequence warps the sealing flange and causes a repeat leak.

The 2GR family V6 - including the 2GR-FSE fitted to the S190 GS 350 / GS 450h and the 2013-2015 L10 GS 350, the 2GR-FKS in 2016-on GS 350s and the 2GR-FXE in the L10 GS 450h - seals its front timing chain cover and cam housings with FIPG (formed-in-place gasket) sealant rather than a solid gasket. Over years of heat cycling the sealant hardens, shrinks and loses adhesion, and engine oil weeps from the timing cover seam and the cam housing joints. ClubLexus describes this as the one major problem of the 2GR V6 and calls it a question of when, not if. The cruel part is the repair geometry: on the longitudinal rear-drive GS there is not enough clearance to pull the timing cover with the engine in the car, so the front subframe with engine and transmission has to come down - a 20+ hour job. Many owners live with a slow weep for years and top off oil instead. This is distinct from the simple valve-cover gasket weep on the older S160 cars.

The GS 450h carries a second, completely separate cooling circuit for the power inverter, consisting of an electric water pump, its own radiator and a fan. That electric pump fails - it is a known wear item on the S190 hybrid - and when circulation stops the inverter overheats. The car sets P0A93 (inverter cooling system performance), lights the master warning and hybrid system warning, and typically drops into a limited-power limp mode or refuses to enter READY. Because the inverter is a five-figure component, a failed $200-$500 pump that is left unaddressed is the cheap failure that causes the expensive one. Low inverter coolant level in the dedicated reservoir produces the same code and should be checked first. This is exclusive to the GS 450h - the GS 350, GS 430 and GS 460 have no inverter circuit.

The water pump on the GS models fails prematurely, typically between 60,000-100,000 miles. Coolant leaks from the weep hole as the internal seal deteriorates, and the pump bearing develops play causing a whining noise. If not addressed, overheating and potential engine damage can occur.

S190 GS models fitted with the electronically controlled brake (ECB) system - the GS 430, GS 450h and GS 460 - use a brake actuator assembly containing an electric pump motor that maintains accumulator pressure. The pump motor's commutator wears, and once worn the motor can stop in a position from which it will not restart, which is why the failure presents as sudden and total rather than gradual. Owners report a clunking or clicking through the pedal, a buzzing/whining/groaning from the engine bay that continues even after the car is shut off (the pump cycling repeatedly), and a full cluster of ABS, BRAKE, VSC and traction control lights. Note the generation and drivetrain discipline here: the GS 350 uses a conventional vacuum-boosted system and is not affected - this is specific to the ECB-equipped V8 and hybrid cars. Lexus ran a Warranty Enhancement Program (ZLG) covering internal malfunctions of the brake actuator on certain 2006-2007 GS 430, 2007-2011 GS 450h and 2008-2011 GS 460, but the coverage cutoff has passed, so out-of-warranty owners pay.

On 2013 GS 350 vehicles built 8 June 2012 through 26 December 2012, the switch that measures how hard the driver is pressing the brake pedal can fail. Insufficient soldering at a resistor inside the switch can open the circuit; the brake warning light then illuminates and the brake control system can initiate braking the driver did not ask for - and because the event is system-commanded rather than pedal-commanded, the brake lights may not illuminate, leaving following drivers with no warning. That combination, unexpected deceleration plus dark brake lights, is what made this a safety recall rather than a service campaign. It is confined to a narrow build window at the launch of the L10 generation.

The 2006 Lexus GS is included in NHTSA recall campaign 06V096000, which covers an improperly assembled air bag inflator used in the side air bag, the curtain shield air bag and the knee air bag assembly. Affected inflators were built with an insufficient amount of the heating agents necessary for proper air bag deployment. Should the SRS system activate during a crash, the expansion force of the gas may be insufficient to properly inflate that air bag, which increases the risk of injury to the occupant in the involved seating position. On a car with as many air bags as the GS, this affects only the specific assembly that received a suspect inflator — the remaining restraints are unaffected. There is no owner-detectable sign of the condition. NHTSA's 133-unit count is the campaign total across all Toyota, Scion and Lexus vehicles covered, not a GS figure.

Owners of 2006-2011 GS models report the dashboard top going sticky and shiny, sometimes cracking or peeling, and some notice a chemical smell in warm weather. A shiny dash can reflect onto the windshield and cause glare. Lexus acknowledged the same condition on other models from this era (ES 350, GX 470, IS 250/350, LS 460, RX 330/350/400h) and attributed it to heat or humidity. The GS is not on the list of models in Lexus's dashboard warranty bulletin. Even so, NHTSA's bulletin index files Lexus dashboard bulletins under the 2008 GS 350.

Early 2013 GS 350 F Sport rear-wheel-drive vehicles built December 12, 2011 through February 7, 2012, equipped with variable gear ratio steering (VGRS), shipped with a programming error in the steering control software. If the car is restarted immediately after being parked with the steering wheel turned, the system can reset its VGRS angle data to zero, leaving the steering wheel off-center by up to about 110 degrees relative to the road wheels. Beyond the obvious annoyance, a driver who does not notice the off-center wheel when pulling away from a parked position could steer the car in an unexpected direction, which is why NHTSA handled it as a safety recall rather than a comfort complaint. It is a launch-year software defect on the L10 generation only; the S160 and S190 cars are unaffected.