The '97 is OBDII. There are 4 different O2 sensors on the '97 Cadillac. http://www.airbagcrash.com
The O2 sensor on a 2003 Cadillac Northstar engine is located in the exhaust manifold. The readings from this sensor are sent to the vehicle's computer, which makes constant adjustments to the fuel and air mixture.
Heated Oxygen Sensor Control Circuit Bank1 Sensor2symptomsOther than the MIL light illuminating you may not notice any performance issues.causeA short in the O2 sensor heater circuit or the sensor itselfA faulty O2 sensor heaterWiring or connectors are broken or frayed to the sensor or relayBad PCM or ECMThe fixCorrect wiring short or loose connector found in inspection.and/orReplace the bank 1 sensor 2, O2 sensor
I believe the O2 sensor heater is a fused circuit, you will need a wiring diagram to tell which one it is.
Before the Cat Conv
There isn't one.
There isn't one.
o2 sensor is on driver side 2nd one back
Cadillac DeVillethese o2 sensors are located aft of the cat that is o2 #2 ,o2 #1 is forward of the cat this is the same on all OBDII compliant auto's Fred@towerpower6@bigriver.net
The 02 sensor on my 95 is behind the radiator and transmission cooler on the exhaust manifold. you cant miss it once you get the radiator and tranny cooler out of the way. Kind of a bitch, though.
It is located about in center of the engine compartment on the backside of the motor against the firewall...right above the exhaust manifold. That would be the upstream o2 sensor. The downstream o2 sensor is located somewhere on the exhaust just after the exhaust manifold...
Heated Oxygen Sensor Control Circuit (Bank 1 Sensor 2)symptomsOther than the MIL light illuminating you may not notice any performance issues.causeA short in the O2 sensor heater circuit or the sensor itselfA faulty O2 sensor heaterWiring or connectors are broken or frayed to the sensor or relayBad PCM or ECMThe fixCorrect wiring short or loose connector found in inspection.and/orReplace the bank 1 sensor 2, O2 sensorReplace PCM if circuit has failed and no wiring issues present, good O2 sensor