Depends upon what symptoms your car is showing as to what might be wrong.
I had a jetta that was sluggish on take off and could almost never get a smooth take off. Clunked between gear changes at times as well.
Reset the gearbox. Clunking went away for a few weeks then came back. Take off issue no change.
Had the mechatronics unit replaced. Clunking went away for a few weeks then came back. Take off issue was better but not fixed.
Reset the gearbox. Faults remained.
Gearbox and mechatronics replaced (believe they come as a unit not the gearbox seperately). Issues fixed. Smooth take off all the time and smooth gear changes all the time. It was such a different car to drive after this fix.
Hope it goes well for you.
1974 1300 Beetle, 1997 Golf GL, 2003 New Beetle Cabrio, 2014 Audi A4 quattro
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