Can you adjust the idle speed on a 130 tdi?

BILKO1

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How do you adjust the idle on the 130 tdi? My friends A4 has an annoying exhaust resonance at idle if you just raise the revs the slightest amount it goes. I've scanned the car with VCDS (thanks Nigel) no faults present.
 
Yes it can be done with VCDS, just adapt the value for idle speed slightly. I did mine for the same reason