⁸Hello. I've had lots of problems with crystallisation around the adblu sensor switch. Paid £400 to have this 'fixed' and replaced. It is now worse than ever. See pix attached. Any ideas? The garage said it could be the hose but surely the crystallisation would not happen at the top.

I don't want to pay for trial and error diagnosis.

Could too much dpf additives cause this?

Thanks in advance

Hello, welcome to the forum.

That external crystallising would suggest a leakage of the Adblu to me, get it cleaned off and check sealing. 

Thanks for reply. I'm wary of peeling off too much and too vigorous. What dissolves it best for the intricate parts? Just warm water?

As I don't use diesel, I don't know the chemical composition of Adblu. Certainly worth trying warm to medium hot water first. Keep away from any wiring connections.

10 minutes ago, Warrior193 said:

I don't know the chemical composition of Adblu

 

Concentrated urine!

 

You can imagine the discussions when the bright sparks decided to make our engines drink it - "what could possibly go wrong!"

The schmoo pictured looks like saline reacting with moisture.

 

I have seen similar with bowls of salt left to reduce humidity and also on the Laurel Garland I won at Brands Hatch, it remained green and never turned brown, I had not realised it had been treated with a saline solution, I hung it in the rafters of my garage above the race car and when I kept finding water pooling on the bonnet I thought my roof was leaking, it was the crystals formed on the Laurels becoming saturated with moisture and dripping.

Some forum comments are saying that even unopened adblue can crystallise if left at wrong temperature.

It seems an absolute disgrace the way they have just bodged so many things to get round the failing emissions.

Let's feed the dirt back in again, then use an additive!

Add some adblue, but use an adblue additive to stop crystallisation!

And we have to pay for it.

16 minutes ago, Daveylamp said:

It seems an absolute disgrace the way they have just bodged so many things to get round the failing emissions.

How would you have gone about meeting the ever tightening requirements?

 

It is a shame that diesel engines have been so compromised recently, but legislation forced it, not the manufacturers.

 

10 minutes ago, Breezy_Pete said:

How would you have gone about meeting the ever tightening requirements?

 

A wise person would do as you have and buy an older diesel!

3 hours ago, Breezy_Pete said:

How would you have gone about meeting the ever tightening requirements?

 

It is a shame that diesel engines have been so compromised recently, but legislation forced it, not the manufacturers.

 

I'd like to think I wouldn't deceive the customers as VW did, and admit their is actually a problem with the dpf filters amongst other things. Mine has been faulted since I bought the car and have had no help from Skoda at all. It was produced months after the models that were replaced as an act of 'good will'. Yet I have had a catalogue of faults all exactly the same as the models that were acknowledged. I even had the Skoda dealer act surprised at various problems whe it was actually in national news.