Toyota RAV4 Problem Report

Toyota RAV4 Rear oxygen sensor can cause emissions failure

(4 reports)
The rear Oxygen sensors are a critical element in fuel control (unlike other vehicles) and can cause an emissions test failure for high CO and HCs. The sensing element cracks and and reports an erroneous steady state lean condition which confuses the computer, which in turn makes the fuel mixture overly rich.
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One or more oxygen sensors may fail resulting in illumination of the Check Engine Light.