P20E8 fault code and urea tank
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Well I've spent the last few days reading through all 44 pages!
508SW 1.6 GTLine BlueHDI '65 plate, 165k miles.
I had the flashing UREA problem pop up a few weeks ago. I suspected urea crystallisation was blocking something in the Adblue system (its shelf life reduces in extreme weather, and this was the first cold day we had this winter, and during the summer we also had the hottest day ever), so I tried 150ml bottle of Forte Adblue Exhaust Crystal Preventer. That was about 350 miles and 3 weeks ago, yet the error didn't disappear.
I managed to clear the P20E8 and P2204 with Diagbox. It took a few attempts. It seems when Diagbox counts down the 30 secs then advises to switch back on ignition, I needed to wait a couple more seconds until I heard a click and then the error was cleared and safe to restart the ignition. I then went for the rudamentory 15min test drive to heat up the exhaust and see if the UREA and EML lights came back on, sadly they did.
A few observations...
It seems Peugeot still can't isolate or solve this problem. They first did a cheap recall on the AdBlue filler cap, then tried a recall on the wiring loom, and have changed the tank design at least 3 times. The latest tank design empties the components of urea when the ignition is switched off. This doesn't seem like they've isolated a fault, just trying to prolong the life of a stupid system a bit longer. Peugeot have had over 7 years to get to the bottom of this and failed, and in the meantime probably made millions extra by selling only complete replacement tanks for over £1,000 a time. They could have made individual tank components replaceable, like the pump motor unit, and the sensors could have been designed to plug into the tank, and instead of the generic P20E8 they could have used unique error codes identifying each component. Instead Peugeot went in the complete opposite direction and chose to make the newer tank version not work at all until updated with their servers - for extra fees of course. Many people on this thread have worked tirelessly trying to get to the bottom of things, and one admitted dedicating 3 years of his life to it.
If you have the P02E8 error, it might disappear on its own, or you might end up throwing a lot of time and a lot more money at it. If you're lucky, at the end of all that you might get rid of the error. But not forever, sadly. Another fact, reported in this thread, is that many have had their complete tank replaced at least 3 times over the years.
So I'm not giving Peugeot £1,160 + fitting + diagnostics for a new tank, which is more than 30% of the price I paid for the entire car a year ago!
In the next few days I'll put it on ramps and try knocking the tank with a rubber mallet, maybe check the state of the NOx sensor and urea injector (if I can get them loose) and take it from there.
However, if I have to spend more than £100 on this problem then that money's definitely going to a garage that will remap the entire Adblue circus completely off my car. It really only seems to be a money-making merry-go-round which after 7+ years suggests they never had any serious intention of fixing. Just like the ECO Start/Stop that only worked long enough to get it through the Euro 6 tests.
PS. Personally I wouldn't advise drilling holes in the Adblue filler cap, as there must be a good reason they elaborately engineered it with a PTFE membrane. I suspect they were trying to prevent moisture evaporating and leaving the tank, as that would leave behind a higher concentration of urea - leading to crystallisation and the risk of blockages.
Removed that crap of a membrane more then a year ago, no issues. Venting is fantastic now, comparing with membrane, it was almost non existent.
Здравейте!
Имам грешка P20E8, видях, че сте почистили инжектора, има ли резултат, изчезна ли грешката? И аз мисля да видя в какво състояние е моята.
Thank you for your reply, only I don't have a clue as I don't know your language, sorry.
Hello!
I have a P20E8 error, I saw that you cleaned the injector, did it work, did the error go away?
Hi,
No, it keeps coming back. I ordered a new injector now. It was quite cheap, found it on Ali Express for only €25,- brand new.
Decided to try replacing the injector first because a new ad blue tank is much more expensive.
The injectors are known to fail around 200.000km, mine has run 192.000 now.
Hopefully it will solve the problem.
Благодаря за отговора, надявам се да имате късмет, пишете за резултата след смяната на инжектора.
Hello,
I'm having adblue issues with my 2016 308sw too. Been getting the light and dash warning on and off for six months. The first time I got the warning, shortly after buying the car, I topped up the tank which was empty and the light went away for a bit. But then periodically it would come back on, warn me that it wouldn't start after 1500 miles, and then disappear again. 7k miles later it came on again last week. I thought I'd check how much adblue had been used - none! The tank is still full! Then for the the first time it began the countdown to not starting. Currently on 1300 miles. I've spent a good while looking around and haven't found anyone saying that their adblue wasn't being used. Strange. Took it to local peugeot specialist so they are having a look next week. Assuming I'm going to find myself in the new tank nightmare, does anyone have any experience with neo brothers? They sell new tanks. A £1600 garage bill is going to ruin me so I'm hoping to be able to source the part more cheaply myself and get it fitted by the garage. I've had a lot of peugeots over the years, and have occasionally said 'never again', but I think this time takes the biscuit. It's a great car, but with an issue like this on top of all the other more normal issues there's no way I'm buying another peugeot diesel again.
I'm having adblue issues with my 2016 308sw too. Been getting the light and dash warning on and off for six months. The first time I got the warning, shortly after buying the car, I topped up the tank which was empty and the light went away for a bit. But then periodically it would come back on, warn me that it wouldn't start after 1500 miles, and then disappear again. 7k miles later it came on again last week. I thought I'd check how much adblue had been used - none! The tank is still full! Then for the the first time it began the countdown to not starting. Currently on 1300 miles. I've spent a good while looking around and haven't found anyone saying that their adblue wasn't being used. Strange. Took it to local peugeot specialist so they are having a look next week. Assuming I'm going to find myself in the new tank nightmare, does anyone have any experience with neo brothers? They sell new tanks. A £1600 garage bill is going to ruin me so I'm hoping to be able to source the part more cheaply myself and get it fitted by the garage. I've had a lot of peugeots over the years, and have occasionally said 'never again', but I think this time takes the biscuit. It's a great car, but with an issue like this on top of all the other more normal issues there's no way I'm buying another peugeot diesel again.
Maybe you can try an adblue additive like Tunap 988 or Warmup crystal cleaner. Maybe it will not work but as it’s cheaper than a new tank i think it’s worth to try. I have also the light coming on and off from 3 month and juste added one of this additive i’m waiting to see if the light come back. Basically this additive are a detergent so they can clean the circuitry. Surfactant also decrease the surface tension of a liquid. It will help to create smaller droplet in the injector and decrease clogging if exhaust is not warm enough.
Reading up on the additives a little it seems like they might work for prevention, but it's less likely that they will work as a cure? Not using any Adblue for 7k miles does suggest something is blocked though. Perhaps I should get on it with a rubber mallet. It's in the garage tomorrow, so will see what faults it throws up
Are you really sure none Adblue has been use ? I think that in that case the error would have not disappear on its own. This model 1.6 bluehdi use a lot less Adblue than the 1.5 bluehdi. Depending of your driving style and condition you can consume really little.
For additive some people report that error disappear after use but maybe they just get lucky.
You should not fill the tank completely. Peugeot advise to keep at least 3 to 4L empty.
I might be one of the lucky people.
When the problem started, I put Ad Max in the Ad Blue tank and topped it up with Ad Blue mixed with Ad Max.
I also bought a OBD2 scanner which enabled me to remove/reset the fault code myself, so I could keep driving with the countdown running.
I had already ordered a new injector on Amazon (only €25,- instead of €75,- in online shops).
I was waiting for better weather to replace it.
Only yesterday all tje warning lights and countdown dissapeared all by themselves.
So I guess (and hope) that the Ad Max has done its job.
Think it's about 1000-1500 km ago since I put this in the tank.
Let's just hope it will stay ok.
Which one did you buy?
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