DTC P0135: Heated Oxygen Sensor No. 1 - Heater Circuit Malfunction: Condition
WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Engine Control Module (ECM) detects Heated Oxygen Sensor (HO2S) No. 1 heater circuit voltage input is lower or higher than predetermined. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- HO2S No. 1 malfunction.
- HO2S No. 1 heater circuit malfunction.
- ECM malfunction.