check engine light is on constantly
I have a PO421 code,should I change the lower oxygen sensor?
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3 Answers from these members:
Providing a complete model number to your question will definitely help an expert better your search. If you would like to reply to this thread with a complete model number included I would be more than happy to assist you. Have a great day.
2000Ford Focus ZX3.Don't have VIN at this time.
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