P0300 VOLKSWAGEN - beetle turbo

Question

I have code P0172 and P0300

Answer 1

P0300 Random misfire

P0172 System too rich

You have a misfire cause by getting to much fuel than air, This can come from a plugged airfilter so this should be the first item to check, When a rich misfire occurs you are basically getting more fuel than air , this can come from a leaking fuel injector,a failed fuel pressure regulator,