TDI with Adblue exhaust deposit.

[Boy]

My Allroad year 2015 which has the 2.0 tdi with Adblue system has a white dust deposit around the tailpipe. Is that a sign that the Adblue injector is worn or that the system needs to be adjusted? Or, is this normal? Engine has now done 105k miles and runs very well, achieving 50+ miles per gallon in rural running without excessive acceleration.

[Crasher]

I would say there is definitely a problem and the SCR cat on those is VERY prone to blockage of urea crystals from a dribbling injector.

[Boy]

Thanks Crasher. Presumably the fix would be to fit a fresh Adblue injector. Would that then need to be adjusted or the settings altered in any way?

[Crasher]

It is plug and play, the concern is crystallisation