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