I've just bought a PD130 with 240K miles on it. It pulls like a train and has loads of power but it has a few issues.
The idle is very rough when it wants to be.. some times it is very rough and shakes the whole car but others it just vibrates. After scanning with VCDS i found a few faults regarding the temperature sensor. I replaced this with a cheap after market one, the temperature now rises fine on VCDS, not on the dash but that's because my temperature gauge doesn't work. After replacing the sensor it seems to have made the idle smoother although this may be in my head lol.
I have warmed the car up and then logged the idle regulation (group 13) and the "Torsion Value" (group 4). I torsion value should remain stable but it swings from -3 to -1 and the injected quantities are very different.
It had a lot of noise at idle when I bought it, most of the noise went away after I topped the gear oil up (it took 600ml). I'm presuming that damage will have been done by the previous owner not keeping an eye on it. If I accelerate hard through 1st it doesn't want to go into 2nd. I have to let the revs drop before it will pop into 2nd and the gearbox is overall quite "notchy".
I just wondered if anyone could suggest anything.