What is causing the service engine light to stay on?

Question

Changed downwind 02 sensor located at the outlet of catalytic converter and checked fuses. My 2002 Buick Regal v6 3.8 has under 80, 000 miles. Pulled codes P0141 H02S-12 before and after swapping sensors. Service engine light remains on. Any idea what might be wrong?

Answer 1

P0141 02 sensor heater circuit failure

You need to test for a electrical failure , this is the common cause for a P0141 to set.

​ You need to test the PNK wire for batter voltage key on engine off, and test for ground