Code P017, Front Oxygen Sensor Not Ready: Notes
WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
PCM provides a .45-volt reference signal to oxygen sensor on circuit No. 412. When warm, a properly operating oxygen sensor will provide PCM .45-volt reference signal lower (less than .45 volt) to indicate a lean mixture and higher (greater than .45 volt) to indicate a rich mixture. If oxygen sensor does not vary from cold or not-ready voltage under test conditions, PCM assumes sensor cannot respond to air/fuel mixture changes and sets a Code P017. Possible causes of Code P017 are:
- Open in circuits No. 412 or 413.
- Short to voltage on circuit No. 412 or 413.
- Oxygen sensor cannot respond.