Adblue fault

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TeodorM
Posts: 11
Joined: 07 Mar 2024, 22:03

Adblue fault

Post by TeodorM »

Hi all,
Apologies in advance if this has been already discussed.
It is Peugeot 3008 2019 2.0l bluehdi 130kW.
I had warning message on the dashboard "engine fault" together with "adblue" light. On Diagbox I can se 3 faults- P208E 71, P20A2 21, P20E8 21.
1st one refers to jammed injector ( see attached pictures) and the other 2 to pressure of the system. I deleted them, went for a spin and all good , no warning messages. Connected it again to Diagbox and I saw P20A2 21 and P20E8 21 faults again. I assume that first fault triggers the warning light on dashboard. I ran an actuator test and tested the injector, pump and pressure and all shows no issues. I can even hear the noise of the pump and injector. I read on the forums that injector can be clean or changed relevantly easy buy have no idea how to proceed with the other 2 faults regarding the pressure. Some people advice to start with changing the tank cap.
If anyone have any experience with this and can share some of it would be much appreciated.
I am planning to travel across Europe in 2 weeks and the last thing I want is to get that message in the middle of my journey and have a countdown with 500 miles left.
Thanks in advance
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GiveMeABreak
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Re: Adblue fault

Post by GiveMeABreak »

Are you using any anti-crystallisation additives? If not, I suggest you get some in there now and top the tank up. Wynne's is good - this will help get rid of any crystallisation that has built up and keep it free in future. It may take some time to work through though.

The injector can block quite easily and this will cause a pressure fault in turn.
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Marc
TeodorM
Posts: 11
Joined: 07 Mar 2024, 22:03

Re: Adblue fault

Post by TeodorM »

Thanks for your reply, GiveMeABreak
No, I am not using any additives. I have never come across with Adblue system before.
Do you think is worth cleaning ( or changing) the injector or first I shall give a try to that additive?
As I said my only concern is that I have to travel soon.
Thanks
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GiveMeABreak
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Re: Adblue fault

Post by GiveMeABreak »

Well it's not going to help with further driving with the issue you have - it will likely only compound the problem. The dealer will charge you £120 diagnostic before they do any investigation. I would treat the vehicle now with some Wynne's and get that in whilst topping the tank up and let that circulate and get to work.

The countdown will only appear when it thinks the Adblue tank is low - which won't be to do with the blockage. You'll either have to get someone to check the injector area for crystallisation and clean it out if necessary. If it's in the tank, then not a lot you can do now except try the additive.
Please Don't PM Me For Technical Help

Marc
TeodorM
Posts: 11
Joined: 07 Mar 2024, 22:03

Re: Adblue fault

Post by TeodorM »

Yeah, I have already order that additive and will give it a try. If I have time will check for crystallisation around the injector as well.
Thanks for the advice.
TeodorM
Posts: 11
Joined: 07 Mar 2024, 22:03

Re: Adblue fault

Post by TeodorM »

***update***

Hi all, quick update from me.
I ordered a new injection and changed it. Drove it for a few days and there was no warning lights on the dashboard. Yesterday I contacted Diagbox and saw that the faults were gone by themselves. Also went for a spin with live data on Diagbox. The pressure of the additive was 5.8bars and when the injector operate it dropped to 5.1 bar( see attached photos). Is that the correct pressure of the system? I suppose in that case that pump is not dead.
I added Wynn's additive for Adblue as well. Will drive it for a week and then will check for faults on Diagbox again.
🤞🤞🤞
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GiveMeABreak
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Re: Adblue fault

Post by GiveMeABreak »

That pressure seems about right. It was likely the UREA injector was blocked. Keep using the Wynne's regularly when you top up and hopefully it will work its way round and help prevent further issues.
Please Don't PM Me For Technical Help

Marc