The oxygen sensor (lambda sensor) measures the oxygen content in exhaust gas, letting the ECU fine-tune the air-fuel mixture for efficient combustion and emissions control.
If you notice any of the following, the part likely needs replacement:
Poor fuel economy
Check Engine light with an oxygen sensor fault code
Rough idle or hesitation
Failed emissions test
Installation information
Screws into the exhaust manifold or pipe — always use anti-seize compound on the threads (avoiding the sensor tip) to prevent seizing for future replacement.
Frequently asked questions
The ECU relies on this sensor’s reading to fine-tune the fuel mixture — an inaccurate reading can cause the engine to run richer (using more fuel) than necessary to compensate for uncertainty.
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August 2026
★★★★★
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Toyota Avensis
August 2026
★★★★★
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June 2026
★★★★★
Super fast delivery of the part, and good quality of the used part. Thanks for the service.
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May 2026
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February 2026
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November 2025
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