Had a bad O2 sensor that killed the catalytic concerter on my 2000 Forester. Replaced both of them but even with the bad sensor I was getting above 25MPG. Now with the new sensor I'm getting just above 20MPG.
It's only been a week since I replaced the sensor and the cat. Does it take a while for the ECU to readjust itself? I did reset it and the CEL has not come back on, and the car does seem to performing much better already. This seems to be the only hiccup.
It's only been a week since I replaced the sensor and the cat. Does it take a while for the ECU to readjust itself? I did reset it and the CEL has not come back on, and the car does seem to performing much better already. This seems to be the only hiccup.