O2 sensor

Tiny
KEITH RICHARDSON
  • MEMBER
  • 2003 CADILLAC DEVILLE
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 128,000 MILES
My code reader when I plug it in says that B1S2 is 99.2%. Should I replace the post O2 sensor? No code shows up and check engine light isn't on.
Monday, October 21st, 2019 AT 8:46 PM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

No. This oxygen sensor has but one job and that is to measure the efficiency of the catalytic converter. When the catalytic converter has been deteriorated past it's useful lifetime the Power-train Control Module PCM in your vehicle will set Direct Trouble Code [DTC] P0430 and your Malfunction Indicator Lamp [MIL] or "check engine" light will illuminate. I hope this helps.

Thanks,
Alex
2CarPros
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Monday, October 21st, 2019 AT 10:36 PM

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