Hi guy I recently brought an 03 forester auto single turbo, when I brought it, it had cel for upstream 02 sensor. Today i replaced the 02sensor and cleared the code, and it instantly started hunting on idle took it for a drive and it ran like a bag, tried removing battery also, if i unplug the sensor cel comes on and it and car runs good what should i check/be looking for?? Cheers ethan. Sent from my iPhone using Tapatalk