Operation CHARM: Car repair manuals for everyone.

DTC 41

Self-diagnosis LED indicator blinks forty-one times:

A problem in the Oxygen Sensor Heater Circuit.


vvCODE [41] Oxygen Sensor Heater Circuit:





The Oxygen sensor heater aids the oxygen sensor in warming up faster and starting closed loop operation sooner.

The Check Engine warning light and ECU LED may come on, indicating a system problem, when, in fact, there is a poor or intermittent electrical connection. First, check the electrical connections, clean or repair connections if necessary.