Originally Posted by mr ilia
Well you have to ensure you have o2 sensor in your car.
Check under the car, just before the cat you should see the sensor, if it is not there may be your car was not equipped with one.
91 318is - M50NV (gone)
02 WRB Subaru WRX EJ207 forged, 320 AWHP stock turbo.
85 - 325
02 325i Sedan