I get this Check engine light a couple days ago and the code reads: -P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)


I replaced the O2 sensor on the front bank downstream after the catalyic converter. I unplugged positive on the battery for a few seconds and the CEL came back on after just a few seconds after start up. Need help, any advice?

 

Bank one is the rear of the engine by the firewall. Is that the one you changed?

 

No, I changed the one closer to the front bumper. If bank one is rear of engine that would explain why the light keeps coming on. I had someone clear it with a OBDII scanner and it popped on within 15 seconds after restart of the engine.

 

bank one is in the rear. im not sure if they are the same. one is longer then the other.

 

That explains it!

 

Just want to give an update. I swapped the 02 out for the rear downstream. The CEL has been off for almost a week now. Thank you everyone for your help.

 

If it's any consolation, when the heater circuit on one fails, the other often isn't all that far behind.

 

Good to know, The front one (bank 2) is found is easier to change.