Problem Reports
Toyota Celica
Report: Rear oxygen sensor can cause emissions failure
Toyota Celica Problem
2 Reports
Model Years Affected: 1996, 1997
Verified
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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