so i just completed an engine swap on a 05' wrx. We swapped stock motor for a stock motor. I took it for a drive and the check engine light came on took it to autozone to see what the deal was.
The first code read:
System to lean- bank 1
(Cylinder number 1 denotes bank 1)
1. Faulty MAF sensor
2. Large vacuum leak
3. Low fuel pressure
4. Plugged injector or cylinder misfire(the car doesn't feel like its miss firing.)
The second code read:
Heated Oxygen sensor - Bank 1 sensor 1 sensor circut range/performance high
1. open or short circut condition
2. Poor electrical connection
3. Failed HO2S11 (bank 1 sensor 1)
My turbo failed and sent shards of metal everywhere and oil into the throttle body and possibly down the exhaust. So i was thinking that maybe the O2 sensor is fouled up. But I'm not to sure why it would run too lean. If anyone else has had this problem I would like to know what you did.