1999.5 VW, MK4, 2.0L AEG. . Codes are P0300, P0301, P0304, P1128.

Question

Car runs fine after first start up, then after a while of driving, it starts to sputter and surge with a strong gas smell. I have replaced the MAF, pre-cat O2 sensor, plugs, wires.

Answer 1

Hi there,

P0300, P0301 and P0304 indicate a misfire on cylinders 1 and 4. Here is a list of possible causes.

P0301 VOLKSWAGEN - Cylinder 1 Misfire Condition

Read more: https://www.autocodes.com/p0301_volkswagen.html

P1128 indicates the fuel mix is too lean. Here is a list of possible causes. 

P1128 VOLKSWAGEN - Long Term Fuel Trim B1 System Too Lean

Read more: https://www.autocodes.com/p1128_volkswagen.html