2002 Saturn SL2 with 56520 mi. I'm reading an error code PO137: O2 Sensor Circuit Low Voltage Bank 1 Senor 2. I purchased a new 02 sensor for the manifold, but wasn't convinced to which sensor this code is referring. Is it the one in the manifold or aft of the converter? I checked voltage out of the manifold O2 sensor with the sensor over 600 deg. F. Per my IR thermometer and got 0.82VDC, which was ok according to my Haynes manual (range of 0.1 - 0.9VDC). I then checked for a reference voltage at the electrical connector and only got 0.18VDC (should be approx 0.5VDC with ignition on and engine not running). Is this low reference voltage my problem, or am I chasing the wrong 02 sensor? Thanks for your help.
have the same problem?
Monday, November 20th, 2006 AT 10:52 PM