Pcm Code E017, Left Oxygen (O2) Sensor Not Ready: Description
WARNING: This page is about a different car, the 1992 Cadillac Seville and 1992 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
When warm, a properly operating O2 sensor will drive 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 O2 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 E017.