Lexus · Known Issues

2004 Lexus GS Problems: 1 Known Issue

2004 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated November 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2004 Lexus GS has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. Across all issues with published estimates, repair costs range from $300 to $1,600. DIY maintenance guides at au7o.io.

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On the 1998-2005 Lexus GS, 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.

Common Symptoms

Burning oil smell after driving
Oil pooling in the spark plug wells
Oil residue down the side or front of the engine
Dropping oil level with no visible drips
Oil visible inside the timing belt cover

How to Fix

Diagnose the true source before ordering parts - clean the area, dye the oil, and check inside the timing belt cover, not just the valve cover flange. Replace the valve cover gaskets with OEM Toyota gaskets, torque to spec in the factory sequence (over-tightening warps the cover), and apply FIPG only at the specified corner/edge junctions. If oil is present inside the timing cover, do the camshaft seals and the VVT-i gear O-ring at the same time, and replace the timing belt, tensioner and water pump in the same operation since the front of the engine is already open - the belt interval on these engines is 90,000 miles and all three engines are interference designs. Budget accordingly: valve covers alone are a few hundred dollars, but a combined seal-and-belt service runs well over $1,000.

Typical repair cost:$300 - $1,600

Research This Issue

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Community Reported

Medium ConfidenceVerifiedUpdated Nov 7, 2026

NHTSA Recalls1 recall

EXTERIOR LIGHTING

SABERSPORT IS RECALLING 16,270 COMBINATION CORNER AND BUMPER LAMP ASSEMBLIES OF VARIOUS PART NUMBERS SOLD FOR USE AS AFTERMARKET EQUIPMENT FOR VARIOUS PASSENGER VEHICLES. THESE HEADLAMPS FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THESE LAMPS DO NOT CONTAIN THE REQUIRED AMBER SIDE REFLECTORS.

Campaign #09E01200007/04/2009

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Frequently Asked Questions

What are the most common Lexus GS problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2004 Lexus GS has 1 documented issue. The documented issue is: S160 Valve Cover Gasket, Cam Seal and VVT-i Gear O-Ring Oil Leaks. None are rated critical, but regular maintenance is recommended.

Is the Lexus GS reliable?

The 2004 Lexus GS has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Lexus GS problems?

Repair costs for known Lexus GS issues range from $300 to $1,600, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 1998-2005 Lexus GS S160 Valve Cover Gasket, Cam Seal and VVT-i Gear O-Ring Oil Leaks?

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 b… Repairs typically run $300-$1,600. Severity: medium.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.