cat320

I have a 2000 chevy express 3500 with the 5.7 liter engine has roughly 80K or so on it . we brought it to the body shop truck was running great they had it for 1 week got it back was running so rough. it has had new plugs and wires not long ago. we scanned it and found a trouble code PO137 and under that it said 02 circuit low voltage then Bank 1 sensor 2.


Has any one ever had this code and know where or what it is?

canucklehead

O2 sensor needs replacing. I would do all 4. Not just one. The 2 upstream ones feed info to the computer for fuel mixture and timing. If they are out, then rough running could result.

cat320

we started looking at what the problem might be we did cap and rotor after market and plugs and wires less than a year ago. we checked them all over again. we bought a GM cap and rotor because we heard that it may be the whole problem checked the plugs and wire. looking for a cause on the driver side plug closest to the bumper not firing right. is there something else that we could be missing.

canucklehead

Jeez. Did you not read my last post?...lol
You said...
............02 circuit low voltage then Bank 1 sensor 2....
02 means Oxygen Sensor. Its part of the emission control system on the exhaust pipes after the manifolds. 2 before the catylitic converters and 2 after
Fix that first. Then see.