P0172 Volkswagen - MKIV Jetta 1.8T

Question

I've checked several things, I just recently replaced the MAF, had the whole exhaust tightened/regasketed, new O2 sensors, I don't believe it is misfiring, so out of the possible causes that leaves me with faulty injectors, or incorrect fuel pressure.. I'm just not sure how to determine whether my injectors are bad, or how to even check the fuel pressure.. Any tips, or other things to check before I take it to someone more professional and have them take a look?

P.S. I do have a boost leak somewhere, I have yet been able to locate it, I don't know whether this would play a factor in this code or not, just throwing it out there.

Thanks,
Austin

Answer 1

P0172 Fuel system rich Bank1

When a engine codes a running rich condition this is usually mechanical problems., Test the fuel pressure regulator, pull the vacuum hose off and check to see if fuel leaks out from the diaphragm.and into the intake.