Anyone know where power for sensor is supplied. Is it the ecu? My Bentley is ambiguous. Car is 1985 quantum syncro I5 code JT. Per Huw Powell, my connections are prolly corrroded--haven't had time to check everything yet, but battery voltage 13.9, O2 heater voltage 11.3 open circuit.(Car is very similar to 4kq). Thanks Robert Hemphill