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.
Possible Causes
Intermittent Condition
O2 Heater Element
O2 Sensor Heater Relay Supply Circuit Open Or Shorted To Ground
O2 Sensor Heater Relay Control Circuit Open
O2 Sensor Heater Control Circuit Shorted To Ground