Afternoon all, I’ve been chasing an intermittent issue with the Adblue system and ‘think” I might have a faulty DEF injector. I’m now seeing the dreaded countdown to not starting message, which I’ve had before but mysteriously disappeared a few times, but now it seems more permanent.

I have loads of the usual DEF type fault codes but I think I have ruled out the following
1. The injector was slightly blocked, so it was cleaned and the problem cleared up for a few weeks.
2. Checked the voltage going to the injector and it seems fine, as broken wires feature a lot in these issues.

My latest test was to see if the injector was working properly by applying 12v to it but there was no “click” as I was expecting, so my current theory is that the DEF injector may have failed completely but having removed it, I noticed that the Adblue feed pipe was totally dry, which surprised me, as I was expecting some residual fluid to be present.

My question is, would a failed injector mean there would be no Adblue fluid in the feeder pipe, or is that more likely to indicate a blockage further back, or even the Adblue pump itself?


Any help or advice gratefully accepted  Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey

Might be of some use?

&ab_channel=O%27RileysAutos

Thanks, I’ve watched a few of his DEF ones but this one is for DPF, which I don’t have any issues with (yet!)  Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey

It does detail a blockage of the AdBlue line at the inlet point into the DPF.

Yes, I’ve cleaned out the injector and also the inlet it connects to. It’s wasn’t particularly bad compared to some of the videos I’ve seen on YouTube.
I think my issue now is that there isn’t any Adblue getting to the injector, or if it is, the injector isn’t firing it in to the DPF.

Cheers Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey