P0138

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 for 0.5 seconds. If during two driving cycles the rear oxygen sensor's output is greater than 1.058 volts, the ECM will set P0138 and MIL will turn on. This code indicates an extremely high voltage reading by the rear oxygen sensor or ECM.

Test Procedure Part 1:

Test Procedure Part 2: