DTC P0134: Heated Oxygen Sensor No. 1 Circuit - No Activity Detected: Condition

DTC is set when Engine Control Module (ECM) detects Heated Oxygen Sensor (HO2S) No. 1 voltage input is lower than 0.5 volts. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles. Possible causes are:

• HO2S No. 1 malfunction.
• Fuel system malfunction.
• Exhaust system malfunction.
• ECM malfunction.
• Low fuel level.