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

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.

Your Answer:

Cadillac DeVille Experts

  • #1
  • #2
  • #3
View All

Find great deals from top-rated dealers


Related Models For Sale

Used Lincoln Town Car
16 listings starting at $6,298
Used Chevrolet Impala
12 Great Deals out of 560 listings starting at $3,990
Used Cadillac Escalade
7 Great Deals out of 492 listings starting at $6,999
Used Chevrolet Camaro
10 Great Deals out of 421 listings starting at $4,999
Used Lincoln Continental
5 Great Deals out of 35 listings starting at $33,412
Used Chevrolet Corvette
12 Great Deals out of 295 listings starting at $12,900
Used Ford Mustang
34 Great Deals out of 1,367 listings starting at $4,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.