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Ask Your Question2000 Ford Explorer
Question: Replaced cat converter , check engine light came back on
Question
100k miles mechanic said replace cat converter because check engine light is on. replaced cat coverter light goes out. now back on after 10 miles! What now?
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Answer #1
mastertech6371 January 12, 2011, 13:04
Masterif he used an aftermarket converter, then that's the reason. you need a factory or California certified converter. ask your shop what kind of converter they used.
Roy
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Bomberlou, January 12, 2011, 13:13
RookieProbably did. it was only $200 installed. The check engine light was on before the repair. So the only option is to have a factory part installed? Could it be the o2 sensors? If so can you tell which one or would you replace all of them (2 or 3) Thanks Roy
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Brian Glastetter, January 12, 2011, 13:34
MasterThe only way you know if a catalyst monitor sensor (not O2 sensors)has failed is to monitor it with a scan tool- unless of course you want to throw guesses at it. As Roy stated, it probably is a low quality catalytic convertor that is the cause of the check engine light.
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Bomberlou, January 12, 2011, 13:41RookieWhat would you do? What should I expect from the mechanic?
He told me to bring it back..Thanks guys I do appreciate this.Flag This -
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Brian Glastetter, January 12, 2011, 17:21ReplyMasterA scan tool is needed to monitor the catalyst monitors which readings are compared to the 02 sensors to determine the efficiency of the catalytic convertors. This is how we diagnose the system.
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