Code P017, Front Oxygen Sensor Not Ready: Notes

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.