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DPF Additive - Help!
#1
Hello everyone

I have a 1.6 2014 Multispace Berlingo and I have had a warning light stating that the "P Filter is low... Risk of filter clogging up".

It seems I need to top up the additive. On this model does anyone know if this is a bag, or a reservoir? Is this is a DIY job or one for a mechanic? 

Thanks!!
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#2
Hi there,

It's a pouch, fitted inside a black box under the car, just ahead of the rear wheels. Unfortunately you need Citroen Diagnostic software to reset the counter and stop this message even after replacing or refilling the pouch. There's no level measurement, the ECU calculates the level based on mileage. The pouch lasts approximately 100,000 miles from new. A replacement pouch must have the same colour of collar as that denotes the fluid used. They had several types over the years.

Best trusted to an independent Citroen specialist because although you can buy a pouch of fluid for under £100, you can't reset the ECU counter yourself and the message will never go away unless the ECU is told the pouch has been replaced.

Generic OBD tools normally can't do this function.
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#3
Hi, thanks for the reply - it looks like i will have to do that. I wasn't sure if maybe it had a tank but it sounds like it is a pouch. Surprising the calculation is made based on number of fuel fill ups (fault showed after a fill up!). I am guessing it should be ok for a tank or 2s worth of fuel before it completely blocks up?
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#4
Yeah it will run ok for a while. If you look at the fuel cap, and you only have one black filler cap and not an extra blue one beside it, then you have the pouch system. Also correct in that it squirts a bit of Eolys fluid from the pouch, into the diesel tank each time the cap is opened but it estimates the level in the pouch based on mileage & fill ups.

Adblue vehicles with the blue filler cap and tank, started about 2016 onward.
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#5
Maybe there are several different designs...On my Berlingo 2016, I don't need to replace the pouch. It refills. There is an original filling kit. The fluid level can be monitored using an OBD adapter (the cheapest ones do not support this protocol) and "FAP" mobile applications.
It is visible from the line "volume of additive in reservior".
1190 - initial value, means "full".
300 means near empty.

           
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#6
@Buki the OPs vehicle is 2014 so it only has the pouch. Yep, you can refill it but the level shown in any diagnostic capacity is a pure guess by the system, as there are no sensors on that pouch. It could split, be totally empty and the ECU will never know.
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#7
Exactly, this is a calculated value, not a measured value.
If the tank is empty due to a leak, the ECU "will know" not by the level but by the loss of pressure and will register a DTC error code.
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#8
Ah ok, so there's a fault code for no pressure at the Eolys injector. I hadn't considered that.
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#9
Thanks for the replies. 

So if I am getting the code due to a tear in the pouch, and the ecu has detected a change in pressure, would this throw up an extra code and would a standard obd2 scanner like Torque pro detect this?

Given I got the alert seconds after I refuelled, to me it would point to the system thinking it was low based on refills and mileage, rather than a pressure change/tear.

Thanks again for the replies - its an interesting one!
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#10
I don't think a standard scanner would see DPF system codes, but you never know.

I think your right about it being mileage related. The pouch cover is ahead of the drivers side rear wheel and is only held on by one or two bolts I'm sure.
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