[kurkovn2005]

Hello, I just changed my distributer cap and my roter there and it helped alot. I then took the car to schucks and it gave me one code why my check engine light is on. it is "P0171 System too Lean (Bank 1)". The worker there told me that it is the O2 sensor. But I dont know if that is really what it is. This guy is very young and maybe does not know. Does anyone know what it could be. I have a aftermarket air intake on the car when I bought it. It is a 96 jetta. And I get like -5mpg on it. I really need help. I took apart the air intake and cleaned out all the oil and cleaned the MAF. So if you still have advise, I would really appreciate to know what you have to say.