BOV or Air Fuel Sensor Problem?
Hi guys. I just bought my 2004 wrx last weekend. It has an idle problem that I figured I would fix myself, but it turns out that it is more complicated than I thought. It came with a Greddy blow off valve (type s I think) that I believe to be causing my car to have an unstable idle, making it run rich, and causing occasional backfire/afterfire. The bov is atmospheric and is not recirculated. I have no check engine light, but after running a scan today, I found that it does have a P0030 code, which is a code for a malfunctioning air fuel sensor (Bank 1 Sensor 1) heater control circuit. I don't know what to do because I don't know whether the blow off valve or the air fuel sensor is my problem. Since the bov is releasing the excess air, it might just be confusing the computer and making it think that the air fuel sensor is not functioning properly. I need some opinions. I'm trying to pass emissions this week so I can license my car under my name, so any help would be greatly appreciated. Thanks guys!