Where are you located?
Let me save you a ton of money:
You have a boost leak somewhere, your injectors are fine. Do not spend any money on the injectors, it will not help you.
FYI: Neither will the dealership, they are the last place to ever take a CRD. I have worked on more than a half-dozen that have been returned to their owners by dealerships... IN PIECES. Half the engine in the cargo area.
Now, about your CRD. Having the GDE tune is great, but that mileage is dismal. Have you had the timing belt replaced? You are WAY overdue on the age, and the mileage no longer matters, but you would be just about there on that too now. I can most likely resolve your boost leaking issues for you with a visit and an evaluation while the timing belt is replaced - that is one of the two main services I offer. I would suggest however that the bigger service is performed instead, as I suspect that your boost leak is from a failed EGR and dealing with that is also part of the larger package.
The full service I offer is: Installation of ARP studs to cure a guaranteed head gasket leak that your mileage is just before the typical range where it appears - the "low coolant light" is the first indication that this leak has appeared. The studs are a permanent fix.
Replacement of the original style rocker arms. Many CRD owners have had these fail individually on them, and I now believe it is due to an older design that was not reliable in the presence of EGR soot. The new design is much better.
Installation of an EGR-elimination elbow kit, which also offers some performance benefits
Installation / replacement of the factory ceramic glow plugs, which CAN AND HAVE caused several complete engine failures. These are VERY dangerous and a poor design. The replacements are metal-jacketed ceramic that cannot hurt your engine if / when they eventually burn out.
A full timing belt kit and water pump replacement - Doing this is certainly suggested anyway, but if you plan to do anything else on this list other than just the elbow, the labor has to be duplicated and another timing belt needs to be installed. They cannot (should not) be re-tensioned.
This is a long list, but it can be done in (usually) just one day of downtime, and then your CRD is all set for the next 100k miles (on the belt) and far more on the other components... Lots of happy miles in your future!
Shoot me an email (button below) and we can work out the details if you are interested and we can go from there. The main thing I think you need right now is the elbow kit, that will immediately resolve any potential boost leak as the EGR is not a positive-seal device.
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