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Does the 2002 Toyota. Corrolla have 1 or 2 o2 sensors?

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All petrol engines fitted with catalytic convertors have 2 o2 sensors , 1 upstream , 1 down stream , this means 1 before the cat and 1 after , so checks fuel exhaust going in and then check's that the cat is working as checks the exhaust gas's after cat, hope this helps

Posted on Nov 08, 2014

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