Bought a used 06 subaru impreza from a used lot (bad decision in hindsight), and two days after I got the car, the check engine light came on, as well as the cruise control light began flashing and no longer works. Took it in to autozone and they said it was the O2 sensor before the catalytic converter that was causing the CEL to come on. I took the car back, and the O2 sensor wasnt covered by the 90 day warranty, but they did replace all the valves and gaskets as well as the exhaust system, so there aren't any leaks or anything.
Yea my check engine light comes on every month or so saying the bank 1 sensor 1 o2 sensor is bad. So I clear it but never fails to come back on
took car in to have it checked. Mechanic stated that all was well.
This will be the second time I have changed my O2 sensor.