2001 passat - emission workshop
 

Hello,

so i am getting the dreaded emission workshop.

The codes i am getting are p0301-p0304 and p0171

which are misfire on 4 cylinders and system to lean (bank 1).

Here is what i have done

got the 4 ignition coils replace, replaced the mass air flow, replaced the air filter, replace the plugs.

I just check the L wire and it doesn't have any cracks or holes

I don't know what to do next.

any ideas would be great.

Thanks
Scott