Overall Function Test

Start engine and warm to operating temperature. Using DVOM, measure voltage between PCM connector terminal No. 50 (positive lead) and terminal No. 32 (negative lead) by backprobing connector. See Figure. Monitor DVOM with engine at 2000 RPM. Voltage should be less than .21 volt at least once and more than .70 volt at least once.

This DTC is set when vehicle will not enter closed loop. See DTC P0130, P0133 OR P0134: FRONT HEATED OXYGEN SENSOR (HO2S)  for testing procedures