Can anyone help me with this? I put in the decoder and it states P1128. I am not familiar with this code. I was surfing the internet and it said that the code would be MAP low emission? Can anyone help me with this problem and what I could do to resolve the cel from continuing to come on. It seems like it comes on after I drive about 20 miles. I have 2000 A4 1.8Q.

 

The MAF sensor could be bad. But the P1128 is triggered when the fuel mixture is so lean the O2 sensors are constantly in the rich position. I would look at the O2 sensors first. Then check the fuel injectors, fuel pump pressure and volume. Replacing the fuel filter is a good idea also. Vacuum leaks could cause the lean condition as well. I would make sure there are no vacuum leaks and that the oil cap and dipstick are firmly seated.

I typed the code into google and this came up on a vw/audi site, good luck

 

thank you very much. i will check on these things and let you know