DTC P0136, DTC P0137, DTC P0138 &/Or DTC P0140: Notes

Code Definition

DTC P0136: Rear Heated Oxygen Sensor Circuit Malfunction
DTC P0137: Rear Heated Oxygen Sensor Circuit Low Input
DTC P0138: Rear Heated Oxygen Sensor Circuit High Input
DTC P0140: Rear Heated Oxygen Sensor Circuit No Activity Detected

NOTE: Before performing any DIAGNOSTIC TEST, refer toWARNINGS, CAUTIONS and NOTES in DIAGNOSTIC TESTS .

NOTE: Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.