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.
Oct 21, 2019 at 8:46 PM
O2 sensor
2003 CADILLAC DEVILLE
KEITH RICHARDSON
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SCGRANTURISMO
- ✓ASE Certified Mechanic
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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
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
Oct 21, 2019 at 10:36 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.