DTC P0135: Ho2S No. 1 Heater Circuit Malfunction: Condition

DTC is set when Power Control Module (PCM) detects HO2S No. 1 heater circuit voltage input is 13.8 volts or higher, or 8.7 volts or lower. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• HO2S No. 1 malfunction.
• PCM malfunction.