Rear oxygen sensor can cause emissions failure: Toyota Corolla Muffler & Exhaust

Problem overview

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.

13 people reported this problem

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Toyota Corolla vehicles with this problem

7 model years affected

Average mileage: 134,200 miles

(25,000 - 275,000)

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Rear oxygen sensor can cause emissions failure on Toyota Corolla

Problem overview

Toyota Corolla vehicles with this problem

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