DTC P1173 - Left Front Oxygen Sensor, Activity Not Detected: Condition

DTC is set when left front heated oxygen sensor signal voltage exceeds .45 volts and remains unchanged for 42 seconds after engine is started and has reached normal operating temperature. Engine speed at 1150 RPM or greater. Possible causes are:

• Left front oxygen sensor.
• Open or short circuit between terminal 3M on Powertrain Control Module (PCM) and terminal "A" (Yellow wire) on left front oxygen sensor.
• Intake air system, fuel system and/or ignition system malfunction.