October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Code 21

Problem with O2 Sensor feedback circuit. Logic Module monitors circuit when engine temperature is above 180°F and engine speed above 1500 RPM for 6 minutes. Code appears if there has been no O2 signal for more than 5 seconds.