laraflamme97

Lexus SC exhaust leak

I'm having an issue with my 2000 Lexus SC with a gasoline engine. The check engine light comes on and off, engine power is down, and fuel consumption is up. The car has 102882 km. Could this be a faulty exhaust temperature sensor?

A 2000 Lexus SC is experiencing issues with the check engine light, reduced engine power, and increased fuel consumption. The problem may be linked to a faulty exhaust temperature sensor, potentially caused by a small exhaust leak. A suggested solution is to inspect for leaks, possibly using a smoke test at a workshop. The inspection confirmed a small leak affecting sensor readings, and repairs, including sensor replacement, resolved the issue.

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4 comment(s)

That sounds familiar. I had similar symptoms on my old Saab 9-3 – check engine light, sluggish performance. Did you happen to notice any hissing sounds coming from under the car, especially when it's cold? I eventually found a small crack in the exhaust manifold. Could that be it?

Thanks. I haven't checked for hissing sounds. Could a small leak cause such big effects on engine performance and fuel efficiency?

Absolutely! Even a tiny exhaust leak before the catalytic converter can mess up the oxygen and temperature sensor readings. The ECU tries to compensate, leading to problems. Checking yourself depends on how comfortable you are under your car. If not, take it to a workshop for a smoke test. They'll find any leaks fast. Hope this helps!

I had the car inspected at a workshop based on your suggestion. There was a small leak in the exhaust system affecting the exhaust temperature sensor readings. The total repair was 265€, including the sensor replacement. Thanks for pointing me in the right direction.

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LEXUS

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