While doing other front end repairs I decided to replace the 02 sensor, back 1 sensor 1, located right in front of the cat. converter. With the new sensor in I ended up getting p0131 and p0134, low circuit voltage and o2 sensor no activity. checked to see if I was getting 12 volts to the sensor, I was, and really couldn't figure much else out, need to buy a haines manual. But I went ahead and put the old sensor in after reading the aftermarket 02 sensors don't work as well as oem 02 sensor. drove it today to see if light would come back on, it did after a long time, stil only the p0131 code now... My question is, is this electrical problem or something else like ive read about fuel press, exhaust leek, maf sensor. things like that?? and one more question, ive never owned a haines manual before, will it show me things like wiring diagrams, the different grounding points for various electrical?
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Also Im not for sure where the 02 sensor runs to at the PCM, I don't know what plug it runs to to be able to ohm out the wire to see if its open or something.. I hope someone can help, been trying different things and looking things up now for about 2 months. thnx in advance for replying, not for sure when ill be able to check this post cause of school and work. thnx guys

 

Same issue here..along with bad gas milege. I hope someone knows..

 

same problem here. I just replaced both bank 1 and bank 2 o2 sensors, hoping this will get my light to turn off. p0131 and p0300 are my codes currently.

 

Mine ended going after driving the truck for awhile. No idea why or how but it did.