Problem Reports » Rear oxygen sensor can cause emissions failure

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Geo Prizm

 

Report: Rear oxygen sensor can cause emissions failure

Geo Prizm Problem
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Model Years Affected: 1996, 1997

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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 engine computer.

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