Lexus GS (Mk3)
The third-generation Lexus GS (2005–2011, AZ10) is a luxury executive saloon offered in the UK with the 3.0-litre 3GR-FE V6 (GS 300), the 4.3-litre 1UZ-FE V8 (GS 430), and the ground-breaking 3.5-litre 2GR-FSE hybrid (GS 450h). It replaced the previous straight-six architecture with a sharper, more dynamic rear-wheel-drive chassis and introduced the 'L-finesse' design language. Reliability remains exceptional by class standards, but high-age, high-mileage examples must be scrutinised for expensive age-related failures: the hydraulic brake actuator (common to the GS 450h and other Lexus models of the era) can fail with a loud barking noise and long pedal travel, costing £1,800–£2,500 to repair; the Adaptive Variable Suspension (AVS) dampers on higher trims are prone to oil leaks; and carbon buildup on the GS 300's direct-injection intake valves can cause rough idling and reduced performance. Buyers should demand a full Lexus service history to maintain warranty cover and verify the hybrid battery cooling fan has been cleaned regularly on 450h models.
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Common Faults & Reliability
These are the most common documented problems for the Lexus GS (Mk3), sorted by their typical impact and frequency.
Brake Actuator Failure
high severityThe hydraulic brake actuator is a common failure point on this generation, leading to a loss of power assistance, very long pedal travel, and a loud barking or humming noise from under the bonnet. Repair bills are substantial, often exceeding £2,000, and the issue is more prevalent on high-mileage GS 450h and GS 430 models.
Leaking Rear Shock Absorbers
medium severityThe Adaptive Variable Suspension (AVS) shocks are prone to leaking and are extremely expensive to replace with OEM parts.
Leaking Rear Shock Absorbers (AVS)
medium severityThe Adaptive Variable Suspension (AVS) shocks fitted to higher-spec GS models are prone to oil leaks over time. A leaking shock causes a bouncy ride, uneven ride height, and can trigger an AFS warning light. Replacement with OEM parts is expensive.
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