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

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

• Left front oxygen sensor.
• Open or short circuit between terminal No. 3M on Powertrain Control Module (PCM) and terminal "A" (Red wire) on left front oxygen sensor.
• Intake air system, fuel system and/or ignition system malfunction.