STEP 1. Using scan tool (M.U.T.-IIISE), check data list item AD: Heated Oxygen Sensor (rear).
STEP 2. Check of short circuit in O2RL line between heated oxygen sensor (rear) connector and ECM connector.
STEP 3. Check of short circuit in ORLE line between heated oxygen sensor (rear) connector and ECM connector.
STEP 4. Using scan tool (M.U.T.-IIISE), check data list item AD: Heated Oxygen Sensor (rear).
STEP 5. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 . (2) Check the diagnostic trouble code (DTC).
Is DTC P0138 set?
Retry the troubleshooting. The inspection is complete.