nicklockard said:No, in fact they say: "you are your own warranty."
As is anyone who modifies their vehicle to use an out of specification fuel or otherwise adds performance modifications or otherwise messes with emissions equipment. Remember? Read the home page introduction at www.tdiclub.com
The warranty question forced you to acknowledge that the tuners don't guarantee their work. They have no idea what changes they are effecting. They make good guesses, and send you on your way. Hence, no guarantee.
SVO manufactures who DO offer warranties:
1. Kit maker Elsbett GMBH, Thalmassing Germany
2. John Deere, USA
3. Audi , Germany ( a single tank kit for their new TDI )