Pcm Code E13, Oxygen (O2) Sensor Not Ready: Description

PCM provides a .45-volt reference to O2 sensor on circuit No. 412. When warm, a properly operating O2 sensor will drive .45-volt reference lower to indicate lean mixtures and higher 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 rich or lean air/fuel mixtures. Code E13 is then set. Possible causes of Code E13 are:

• Open or short on circuit No. 412 or 413.
• O2 sensor faulty.