o2 Sensor?
 

99 Chevy Silverado, 5.3, z71. Trouble codes p0138 and p0141. Itis thesame 02 Sensor, Bank 1 Sensor 2. I replaced 02 Sensor behind cat on driver side. The codes kicked back. Whats should I do? I really appreciate any help. Thanks.
Bryan

RE: o2 Sensor?
 

mine threw that code as well, i took them out and cleaned them with carb cleaner. You have to let them completly dry before using the truck. I went for two days. It worked great and the codes were gone.

RE: o2 Sensor?
 

Thanks popo. I'll have to give that a shot. This is just one of those petty problems that is really starting to bother me. Did you take out all 4 o2 sensors and clean them? I am guessing that isn't a bad idea. I was also mistaken. The old o2 sensor was giving me problem codes P0138 and P0141. I replaced that sensor and withina few minutes of driving with the new sensor, it kicked a P0140 Sensor CKT No Activity at me.

I am planning on taking out the new o2 sensor and returning it. It cost me $70. Then I'll try the cleaning idea.
Any other suggestions? Thanks.

RE: o2 Sensor?
 

Could that have been a bad newo2 sensor? It was a Standard bought from Bumper to Bumper.The guy there explained them to me as up stream anddown stream sensors. Thesensor kicking the codes is Bank 1Sensor 2, that is downstream, correct? I am pretty sure all the o2 sensors are original. I had a bat cat last year and replaced it, but I've had probs with this o2 sensor(Bank 1 sensor 2)ever since. But get this, my MPG has been good. Highway:18-20, city: 15-17. Part of me doesn't want to screw with it. But I want everything running right, it seems to be idling rougher than normal. Help!?!?!?
Bryan

RE: o2 Sensor?
 

The sensor will make it idle a bit rough. The Bank 1 Sensor 2 is the downstream on the drivers side. Did you get an OEM or did you get a universal? I have used the universal's before and they have worked ok but they were a pain to install due to the wiring connection. Make sure that you get the wiring right.

RE: o2 Sensor?
 

the code could also be stuck in your ECU which means you need to have it cleared out, in mine i was told disconect the battery terminals and hold them together for 10 secounds

RE: o2 Sensor?
 

I just unhook the batt overnight.

RE: o2 Sensor?
 

I cleaned all the sensors and also un plugged them from theharnesses. Check the wire connections as well then reinstall