P0137

DESCRIPTION
Refer to DTC P0130 & P0136.

FAILURE CONDITIONS
After the system is in closed-loop operation and the engine has run for 3 minutes, the ECM checks the rear oxygen sensor's output for 0.5 seconds. If during 2 driving cycles the rear oxygen sensor's output falls below 50 millivolts, the ECM will set P0137 and MIL will turn on. This code indicates an extremely low voltage reading by the rear oxygen sensor or ECM.

Test Procedure Part 1:

Test Procedure Part 2:

Test Procedure Part 3: