CHECK ENGINE LIGHT ON.

Asked by Guru6NPGP Mar 25, 2020 at 08:40 PM about the 2001 Buick Century Custom Sedan FWD

Question type: Maintenance & Repair

CAT CONVERT WAS NOT HEATING UP TO SPECS.WOULNT THAT SET A
CODE?

1 Answer
2,270

RickMN answered 4 years ago

The ECU doesn't check cat temp. It only checks the oxygen level coming out of the cat. It expects to see a fairly steady reading. If the cat isn't working or isn't heating up, the downside oxygen sensor reading will be all over the place. See this post on what the Po420 or P0430 means: https://ricksfreeautorepairadvice.com/p0420-is-it-the-catalytic-converter-or-the-oxygen-sensor/

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