Car Problem Reports

Toyota RAV4 Rear oxygen sensor can cause emissions failure

Toyota RAV4 Problem
3 Reports
Me Too

Model Years Affected: 1996, 1997, 2011

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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