Volkswagen Passat B5 Discussion
My car is a 2001.5 1.8T, auto, Wett chip, TT Diverter valve, K&N drop in.
I had code....
P1128 Long Term Fuel Trim mult.,Bank1 System too Lean
P1137 Long Term Fuel Trim Add.Fuel,Bank1 System too Rich
I changed my o2 sensor, then I cleaned the MAFS, the check engine light went away in two...