I've had a CRD2 for nearly a year now.
First 8-10 months I had no problems at all, power increase was superb and it was a very different car to drive.
However a couple of months ago, I had issues with at first, the spanner light and the car going into limp mode and then the exhaust emissions light and limp mode.
I removed the CRD2 and after leaving the battery disconnected, the spanner light vanished. Thinking it "might" have had something to do with the box, I left it off but then a few weeks later, the spanner light started coming back on almost every day at some point. Then it got worse and the exhaust emissions light started coming on again, almost every time you started it. And this was with the box off!!!.
Car went into dealers and had a pressure sensor ( for the turbo I think ) fitted under warranty. That cured it for about a week and then the same thing started happening again. Car went back in and they fitted a completely new engine management ECU. Thats been nearly 4 weeks and so far, so good, the box has still been off since I first removed it, sat in a cupboard.
Now, the Vaux warranty finishes at the begining of December.
I'm tempted to refit the CRD2 now that the car has got a new ECU on it and I'm guessing there was some fault with that, but I'm worried the CRD2 had something to do with the problems as when I first got the car I ran it for months without a CRD2 and had no such problems.
I miss the extra *oommphh* that the box gives and the head bod at DTUK claims that there is no way at all that the CRD2 could have anything to do with the problem.
So what would you do and what are your reasons for doing so?. Refit it and run it for a few weeks and see what happens or not take the chance at all??!!!.