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Circuit Description

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

Heated oxygen sensor monitors exhaust gas oxygen content and delivers an input signal to ECM. ECM uses input signal to determine fuel injection system operation. DTC is set when oxygen sensor remains at .35 volt or more, or .55 volt or less during vehicle operation once engine is at normal operating temperature. Possible causes are:

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