My CEL light went on today, and I went to Autozone and they detected this code:
P0170
Definition: Fuel trim bank one
Causes: Oxygen sensor defective, Ignition misfire-repair, Fuel injector problem

I replaced the MAF and oxygen sensor 2 months ago. What could be the problem now??
How many oxygen/MAF sensors are in there??
I drive an automatic 2001 Audi A4 1.8T 71,000 miles
Can someone help me understand what this all means.
Thanks.

 

do a seafoam treatment and clean the 2 O2 sensors you have with carb cleaner or intake cleaner. there really hasn't been one direct answer to this question. just hope it's not your fuel injector which usually isn't the problem anyways