Volkswagen Caddy Diesel Problems

You must replace it; the car isn't legal if you don't because the part is a part of the exhaust emission control system, which is required by law to be functional. Going to a van of another make is an expensive move, one that needs careful consideration.

It’s very likely to be a sensor problem. If the sensor in question starts to send false information to the car’s computer, the engine can do all sort of weird things. I’ve even heard of things like exhaust gas temperature senders on this make and model being mixed up during a DPF service with all sorts of problems as a result.

Beyond that a high idle can be the result of a fuel injector problem or even a vacuum leak through a split or missing rubber hose. Even the turbocharger’s trunking – if it becomes split or damaged – can cause this sort of problem, but usually the drama would be a permanent one until the problem was fixed. The intermittent nature of your problem has computer or sensor written all over it. A full electronic scan of the vehicle should be your first step. There’s a very good chance the onboard computer already has a pretty good idea of what’s wrong. You just need to ask it.