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P0420 2001 Toyota Camry -

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could the code P0420 be caused from a faulty 02 sensor

Vehicle: 2001 toyota camry 2.2 liter

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its possible, but I would try to fix P0442 which can also cause it

you might has a loose gas cap, or the seal is bad on the gas cap that is the first step. if you are replacing the gas cap use a New OEM toyota gas cap.

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