[Engine] P20F6 fault

[Roope]

Hi again, after many years!

This is about my Peugeot (model in signature). I can do some things with a very limited OBD reader, so I am not always in the dark. The P20F6 fault came only with a dash message of 'engine fault, repair needed', otherwise no problems, only the engine light illuminated.

Under the car it was a mess. From the AdBlue injector, all the way to the catalytic converter, it was covered in white. I cleaned it all away, cleaned the injector (not looking dramatic -only a normal amount of soot) and put it back. With camera under car I saw no leaks with engine running. I removed the fault and moved on. 

Fault came back next day. I did this 3 times and it always comes back after some time. Maybe x amount of starts, or kms? Still have not found any leak. Today I took it to a Citroen garage. They also found nothing, except my wallet. 

My scanner still gives failed emissions tests; NOx Catalyst Monitor Bank 1. So I am pretty sure tomorrow I get the same engine fault back. Mind you, the problems started in deep freeze temperatures (weeks and weeks of non-stop day and night between -10 and -28 degr) and now I finally have mainly temps above zero. 

My Q: should I try a new injector? Or do I test this one somehow? How would that be? Anything different I could do myself?

Let's see if I can attach some pics now....

[Roope]

Upodate:

Took the car to town and engine fault came back. No surprise there. On the way back I was stopping at my sauna when I noticed some steam coming from under the bonnet. Opened it and it had a foul smell. That's when I also saw -for the first time- the injector dripping Adblue. About one drop per second, that's a lot. 

I wonder this: when and how much Adblue is under normal circumstances injected? 

But I'm getting myself a new injector for sure. Any comments on aftermarket parts???

[evdama]

Upodate:

Took the car to town and engine fault came back. No surprise there. On the way back I was stopping at my sauna when I noticed some steam coming from under the bonnet. Opened it and it had a foul smell. That's when I also saw -for the first time- the injector dripping Adblue. About one drop per second, that's a lot. 

I wonder this: when and how much Adblue is under normal circumstances injected? 

But I'm getting myself a new injector for sure. Any comments on aftermarket parts???

Boiling urine would never smell great
Please update if you can - sorry I cant help with this.

[Roope]

You can count on me updating this thread. People can learn a lot from my mistakes.