Two different error codes on my 2002 VW Golf TDI 1.9L.
PO234 & PO402 on 2002 Volkswagen Golf TDI

The first Code(po234) is a turbo over boost I was told. My mechanic is not sure how to address the repair and I have a certain disdain for VW dealers so...the second code is exactly what your forum described it as. Again, multiple troubleshooting steps listed but maybe that list can be narrowed down some? My inspection won't pass until these codes are cleared, I just dropped a sum of money on rear springs/shocks. I am in need of help, please!

Asked by for the 2002 Volkswagen Golf TDI
Find a shop that works on and are familiar with European vehicles.