O2 sensor

Asked by GuruQ1WJN Nov 19, 2019 at 12:09 PM about the 2000 Cadillac DeVille

Question type: Maintenance & Repair

Code p0420 is it sensor 1 or 2?

1 Answer

Patrick answered 5 years ago

P0420 is a Catalytic Convertor code. If one of the oxygen sensors is causing this code is most likely the rear one. But you could have a bad catalytic convertor, an exhaust leak near the catalytic convertor, or a running condition causing this code. Just replacing one of the oxygen sensors would be a total guess.

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