2008 replacing AdBlue Tank

[lembie65]

I have a 2008 from 2017 that has developed an AdBlue fault. I have checked the codes with Diagbox and it is P20E8 - Reducatnt pressure low. Everything I've read points to needing a new tank. I've monitored the live data in Diagbox with everything up to temperature and the pressure never moves from 4 bar (I know this is the mimimum value it can show and doesn't really mean 4 bar) and the temperature of the urea fluid says 0 C (air temp has been higher than that for weeks).

I'm thinking about replacing the tank myself. Has anybody done this? The part number on my tank is 9812914780 but tanks now available have the part number 9818703780. Will I have any issues after fitting the new tank? Can I just tell the car in DiagBox that I've replaced the tank? Or does it need anything more complicated/contact with the PSA servers? I've seen people say they think it will need telecoding and others that say it just needs priming which can be done in Diagbox.

If you've replaced the tank yourself did you have any issues?

[GiveMeABreak]

That replacement part is not the correct one listed for 9812914780, which may have already saved you some grief

That fault on a 2008 is also listed as a problem with Cyrstallisation between the injector and the heated urea pipe, resulting from an uncoupling of the heated urea pipe.

So I would be checking there first before assuming it's a tank pump issue.

This could affect 2008s with a build date up to 25th July 2018, with DV6FE engines. If you're not sure let me have the VIN. Please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff.

[lembie65]

That's interesting. NeoBrothers are selling 9818703780 (https://www.neobrothers.co.uk/car-parts ... 9818703780) and say it is a replacement for 9812914780. I've also seen this in a few other places.

I've had a look under the car and can't see any sign of a leak or pipes that have uncoupled. Where should I be looking?

[GiveMeABreak]

I'm just going by what the official Peugeot Parts are saying and that's the last replacement part up date they have dated 23/11/2022.

However, having a detailed look at Neo in the link you've prpovided, they actually do list the correct part in the finer detail:

1682615880, 1682620380, 16 826 203 80, 9808559680, 9812914780, 98 129 147 80, 9818703780, 98 187 037 80, OE 9818703780 - PSA Peugeot Citroen

So you should be fine, it's always best to cross-reference and with the link that's all ok.

[wheeler]

I've monitored the live data in Diagbox with everything up to temperature and the pressure never moves from 4 bar (I know this is the mimimum value it can show and doesn't really mean 4 bar) and the temperature of the urea fluid says 0 C (air temp has been higher than that for weeks).

How warmed up did you get it? The pump wont operate till the exhaust (not engine) temperature is 176 degrees Celsius, When it gets to 176 you should see the pressure jump up to over 5 bar.
You will struggle to get the exhaust to this temp just by idling, you normally need to rev the t**s off it.

[lembie65]

I got it above 175 C by keeping the revs at 2.5k for about 5 mins (I read about this on another forum). One of the parameters changes to "Pressurisation 2" at this temperature but the pressure doesn't change from 4 bar at all.

If I clear the code, the error comes back every time I drive about 5 miles.

The temperature of the urea in the tank being 0 C seems odd...

[GiveMeABreak]

If the supply pipe isn't being heated then that will start to cause crystallisation over time and that will lead to a blockage. Can you see any data relating to the heating of the pipe?