Emmision test fails High CO out

Asked by Jun 05, 2015 at 12:17 AM about the 1992 Toyota Corolla STD

Question type: Maintenance & Repair

My toyota corolla ae100  fails emmision test due to high percentage of CO. What is it problem??/ IS that bad Oxygen sensor or Bad MAP sensor.. All others are fine.. How to check faulty MAP and Oxygen Sensors

3 Answers

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More than likely it is a bad o2 sensor,but these can be ohmed to check continuty of it,your car is ob1 so it can not be hooked to a computer to tell you what is the actual problem,but if you know and old school mechanic he can run a test on it by counting the engine light flashes threw what is called a ob1 flash test.

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Co, Carbon Monoxide, is removed by the catalytic convertor. click to size up

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NOx is reduced by EGR and further eliminated by cat. But excessive CO is probably a cat problem

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