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Toyota Avalon Rear oxygen sensor can cause emissions failure

 
Toyota Avalon Problem
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Model Years Affected: 1995, 1996, 1997, 2007

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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 computer, which in turn makes the fuel mixture overly rich.

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