Pcm Code P017 - Front Oxygen Sensor Not Ready: Notes

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 ( more 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 PCM Code P017.

Possible causes of PCM Code P017 are:

• Open in circuit No. 1589 or 413.
• Short to voltage on circuit No. 1589 or 413.
• Oxygen sensor cannot respond.