Code P0171 and P0300,P0301,P0302,P0304
Hi! I have a 03' audi A4 1.8T FWD. engine light on. I did put the scanner to it and give me a code P0171 Bank 1 System too lean.
1. MAF sensor
2. Vacuums lines
3. Breather regulater valve
4. Fuel injector Oring
5. Crankcase breather
6. Suction jet valve
I did erase code, the car get worse but only at idles.
Above 5mph runs fine.
Later the same day engine light come on put scan on it and give me P0300,P0301,P0302,P0304 miss fireing in cylinder 1,2,4,
Now I dont know what to look for MAF or coil?
Any idea? Thanks!