2001 blazer 4x4 with 4.3 motor.
I have had some issues with code p0141. I replaced the o2 sensor behind the cat. erased the code. and drove it around for a few days. Code p0141 poped back up. I did a search a read that i shoud try moving the sensor to see it the code falllows the sensor. So i moved the new sensor to b2 s1 and put the b2 s1 in were the new sensor was b1 s2. Reset the ecu and again i get code p0141. So can anyone help me troubleshoot this?
Would apreciate any help you guy could through my way.

Thanks

 

Sounds like you have narrowed it down to a wiring problem. I would inspect the wiring between the OXYSEN fuse and the O2 sensor heater positive pin as well as testing the ground to the sensor. The wiring diagram below should give you enough information to know where they go to at the connection to the O2 sensor:

 

A little bit of work to figure it out but this will find your problem.......


http://img220.imageshack.us/img220/1141/67078724.png

 

Thanks for the help. I ended up taking it to local dealer. Sorry sobs charged me 85 bucks to pull the plug apart an see that the plug was full of corrosion. Pisses me off big time. Somthing i should of check out. they wanted 200 bucks to put a new plug on it. o well its fixed know. thanks