Hi all. I'm new to Audis and I just got a 2001 A4 1.8TQM. I love it, it's a great car but it has a check engine light on. I went to Autozone and scanned it and got the following code:
Code P0171: System Too Lean (Bank 1)
I looked that up on here and vortex and it led me to believe it was the MAF. I tried cleaning the MAF with isopropyl alcohol. However, this only made the car idle funny (RPMs bouncing around between 750 and 250. It even conked out once.)
So I went back to Autozone and bought some MAF cleaner and tried that. Now it's running a little bit better, it no longer jumps at idle (It still drops low when I start it though.). When I was taking out the MAF to clean it, I noticed what looked to be a leak in something (check valve? Is that what it is?) Could that be the source of my code and idling problems?