Thinking about buying a used Lexus GS (1997–2020) in New Zealand? We've documented 17 known faults for this model spanning suspension, cooling, engine, and fluid leaks. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
17
Documented faults
Critical
Most serious
$800–$1,900
Typical repair
5
Systems covered
Known Lexus GS faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01GS450h rear self-levelling air suspension strut failure
CriticalOccasionalSuspension $2,500–$7,000 to fix
GS450h models fitted with the rear adaptive air suspension system suffer from air spring bladder failure, air line leakage, and compressor wear. Once air pressure is lost the rear of the vehicle sags and the compressor runs continuously in an attempt to recover pressure until it burns out. Height sensor linkage corrosion further corrupts ride-height data. NZ and AU independent workshop forums document this as expensive to repair, with many owners opting for a coilover conversion to eliminate the ongoing cost.
Symptoms to notice
Rear of the vehicle visibly sitting lower than the front, especially after being parked overnight
Suspension warning light on the instrument cluster
Audible compressor running from beneath the rear seat or boot area at unusual times
Harsh or bouncy ride quality from the rear axle
What to check
Measure the rear ride height with a tape measure from the centre of the wheel to the wheel arch — it should be level with the front. Check for rear sag after the car sits for 30 minutes with the ignition off. Listen for the air compressor cycling under the boot floor. Ask explicitly whether the suspension is still on air or has been converted.
Where to look: Rear air spring struts on both sides and the air compressor unit located in the spare tyre well or beneath the boot floor
Ask the seller
“Is the GS450h still on the original air suspension or has it been converted to coilovers?”
“Has the rear air suspension had any warning lights, sagging, or compressor issues?”
“Have the rear air struts or compressor been replaced?”
02Cracking / melting dashboard top
MinorCommonInterior $800–$2,500 to fix
The second-generation GS (Aristo) suffers the well-known Toyota/Lexus dashboard problem, where the dash top cracks, warps or turns sticky under UV. Toyota extended dash warranties in some markets but those are long gone. Cosmetic, but a proper dash replacement is costly and it can make the airbag cover brittle.
Symptoms to notice
Spider-web cracks across the dash
Shiny or tacky surface
Windscreen glare from the dash
What to check
Lift any dash mat and check the top in bright light for cracks and softness near the passenger airbag. This is a bargaining point rather than a deal-breaker.
Where to look: Top of the dashboard above the cluster and passenger airbag
Ask the seller
“Is a dash mat covering cracks?”
“Has the dash top ever been replaced?”
CoolingCritical
EngineCritical
EngineMajor
SuspensionMajor
SuspensionMajor
SuspensionMajor
EngineMajor
CoolingMajor
CoolingMajor
EngineMajor
EngineMajor
EngineMajor
Fluid LeaksMajor
InteriorMinor
Fluid LeaksMinor
15 more documented faults on the Lexus GS
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 17 documented faults for the Lexus GS, the recurring problem areas are suspension, cooling, and engine. A Lexus GS with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Lexus GS?
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We've catalogued 17 known faults for the Lexus GS, covering suspension, cooling, and engine. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Lexus GS?
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Most single repairs on the Lexus GS fall between $800–$1,900 at NZ independent-workshop rates. Some of the 17 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Lexus GS?
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Yes. A Lexus GS inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.