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paulaschubert58

Oxygen Sensor Heater Failure

Hi, I have a 2002 Lexus IS with a gasoline engine. The check engine light is on, and the error memory says something about an oxygen sensor heater failure. I've also noticed higher fuel consumption. Could it be a defective cable or plug connection? The car only has 20972 km!

Summary of the thread

The conversation revolves around a 2002 Lexus IS experiencing a check engine light due to an oxygen sensor heater failure, leading to higher fuel consumption. The initial suspicion was a defective cable or plug connection. It was advised to have a professional diagnose the issue to avoid further damage. Ultimately, the problem was confirmed to be a defective connection on the oxygen sensor, which was resolved at a workshop.

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4 comment(s)

antonia_jones85

Oxygen sensor issues, huh? I've had similar air-fuel ratio problems with my IS. Is the malfunction indicator always on, or does it come and go? Which sensor is throwing the error code? Knowing that info might help narrow down the cause. Though, a defective cable connection is plausible.

paulaschubert58 (community.author)

The check engine light stays on constantly. As for the sensor... I'm not sure which one. Is it possible to check that myself without special car components? Or do I need to check the exhaust system?

antonia_jones85

Given that the malfunction indicator is persistent and you're unsure which sensor is at fault, I'd advise against tampering with vehicle emissions components without proper diagnostic tools. A workshop will pinpoint the exact sensor and confirm if it's indeed a faulty connection before you start replacing car components. Trust me, it's worth preventing more damage, especially to such a clean Lexus.

paulaschubert58 (community.author)

Thanks for the advice. I took it to the workshop, and it was indeed a defective connection on the oxygen sensor. 95€ later, and it's fixed!

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LEXUS

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IS