Heated Oxygen Sensor Control Circuit Bank1 Sensor2
symptoms
Other than the MIL light illuminating you may not notice any performance issues.
cause
A short in the O2 sensor heater circuit or the sensor itself
A faulty O2 sensor heater
Wiring or connectors are broken or frayed to the sensor or relay
Bad PCM or ECM
The fix
Correct wiring short or loose connector found in inspection.
and/or
Replace the bank 1 sensor 2, O2 sensor
hold off and warmer button at same time on heater controls
short circuit in the circuit
97 cadillac deville heater controll
The ECM is located inside the vehicle. It is on the passenger side above the heater box.
There are two hoses going to the heater core. Passenger side of the firewall in the engine compartment. Two 3/4 inch hoses about 3 inches apart.
press n hold the off and warmer buttons on heater controls while key is on
Look for two brass hose fittings within8 inches of each other on the firewall passanger side.
the heater core in the heater unit may not have air going through it, or the hoses for the water to pass through the heater core may be broken. Or the flaps controlling the airflow may not be working correctly
push the AC and heater buttons in at the same time and hold for 6 seconds
02 Sensor Heater Control Circuit Low (Bank 2 Sensor 1) Shorted condition detected in the oxygen sensor heater element control feedback sense circuit
You need to clean or change your heater core Also check your rad cap to be sure that it holds the pressure change it every 2 years minimum
Behind the intake plenum on the passenger side.