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check engine light is on constantly
by Manage My Life Last activity date:
I have a PO421 code,should I change the lower oxygen sensor?
No you have an ineffective cat. Contact your dealer for warranty info as the government mandates the manufacturer has extended coverage for emissions issues. They will be able to tell you if it is covered or not.
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.
Answered in 8 minutesby afritz afritz |
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