Hi I'm new so forgive me if I missed a previous post on my problem. My 05 330xi was chugging and acting like the catalytic converter was plugged. I got it home and now it won't start I ran obd and it gave 0171 and 0174 codes. I left it to sit for the winter and the battery died. I recharged it and it started and ran fine. I drove it for a day and it ran fine but now it won't start again. Amy help is greatly appreciated.