What went wrong with your fuel filter?
So far I have replaced the G62 Coolant temperature sender after a fault code appeared on vag-com.
I have just finished fixing a problem with the EGR which took about a month to diagnose. I had tremendous turbo lag, car stalling, with RPM's dipping when I tried to accelerate and in the latter stages the car would just stall when trying to pull away.
Unplugging the MAF would cure this problem.
The vacuum hose from the EGR to one of the solenoids was replaced and this fixed the issue for two weeks, then it came back. Before this, I replaced the MAF and air filter with no success.
After some further diagnosis I found that Solenoid (N18 I believe) to be at fault, I replaced this and everything is once again fine. In between this I cleaned out my EGR and Intake Manifold and the system is now nice and clean and working perfectly.
My main annoying 'fault' at the moment is rough idling which is alot more noticable when the engine is up to temperature. This appears to disappear when the air conditioning is on.
I have had a fuel injection sensor in the top of the engine block replaced as the local independent tech said he had seen this on a number of cars, this has lessened the problem to some extent but I still get the issue.
The whole of the engine shakes at idle intermittently.
The car drives perfectly fine, it's just this lumpy idle.
This is a 1.9 TDI B6 engine.