DTC P0134 - Front Oxygen Sensor, Insufficient Activity Detected: Condition

DTC is set when front oxygen sensor signal voltage does not exceed .45 volt after engine is started, or stays below .45 volt for 80 seconds after engine has reached normal operating temperature. Engine speed at 1500 RPM or greater. Possible causes are:

• Low fuel level.
• Front oxygen sensor.
• Open or short circuit between terminal No. 3C on Engine Control Module (ECM) and terminal "A" on front oxygen sensor.
• Open circuit between terminal No. 3O on Engine Control Module (ECM) and terminal "B" on front oxygen sensor.
• Intake air system, fuel system and/or ignition system malfunction.