DPF health check

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GiveMeABreak
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Re: DPF health check

Post by GiveMeABreak »

That part number isn't currently listed with PSA - but may of been the original equipment manufacturer part number that represented the old internal PSA part number of (6500FQ) that was for your vehicle up to build date 11921. Your build date is 11657. However, there have been several replacement parts for this unit since then. The latest part is as I specified, so will be correct for your vehicle.

So a long-winded answer, but yes :-D

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osx
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Re: DPF health check

Post by osx »

Looks like the part number is not very specific. Same part number for 1.6, 2, 2.2, 2.7 Citroen C4/C5, Peugeot etc. How does this work?

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Re: DPF health check

Post by GiveMeABreak »

Sometimes they share the same peice of equipment amongst models and other times not.

In this case, part 9807028580 for the engine fusebox is now the only one supplied new for all C5 X7s and of course listed against your VIN. The one you have already, was probably on older fusebox which has been superseded.

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Re: DPF health check

Post by osx »

Any point removing it and giving it a good clean before buying a replacement?

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Re: DPF health check

Post by GiveMeABreak »

A couple of things:

When you said earlier that the engine cut off - do you man it hesitated and then resumed, or did the engine cut off and you had to stop?

There are 2 issues you have - if hesitation and the DPF message (I assume this was "risk of particle filter clogging") then it is having a problem regenerating. Ideally keep it in 4th gear at 40-50 for 10-20 minutes on a good stretch of uninterrupted driving to allow the engine to get to temperature and allow a regeneration to take place. If it keeps getting interrupted (short journeys / stopping the engine frequently) and not allowing the engine to reach operating temperature, then regeneration (assisted or natural) will have difficulty taking place.

Even though the additive system reduces the temperature required for the burning off of the particles from 550°C to 450°C, if the temperature in the exhaust isn't getting to 450°C, then regeneration is not going to happen and clogging will start to increase, leading to the message and possibly going into backup mode with reduced power.

Second to this is your specific fault code that relates to the main relay being stuck (P0215), which won't result in the engine management light being switched on. This fault generally relates to a starting problem. The fault will go when a) the engine has been idling for several seconds or b) when the engine has been cut following a phase in which the engine management ECU becomes dormant.

So did you clear the P0215 fault and been for a few spins in the car since - then re-read the car to see if the fault has gone?

It may be that the main relay has become 'unstuck'. But if it happens again, then the relay may be faulty.

There's not a lot you can do with these fuse boxes add all the relays are internal and they are not designed to be user-serviceable - they are just replaced when they start to act up, but nothing to stop you checking the electrical connections of course.

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Re: DPF health check

Post by osx »

Proper cut off. Had to stop while there was still some pressure in the system for braking. I do mostly motorway miles and do runs of 10-15 min at 4000 rpm. Haven't replaced or cleaned the DPF though.

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Re: DPF health check

Post by GiveMeABreak »

Ok, so a proper cut out then. Incidentally, don't worry about the brakes, they will always work even without the assistance from the brake servo - but may just take a harder press on the pedal once the vacuum reserve has dissipated.

What's the mileage on the car now - just so I can get an idea of likely filter life?

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Re: DPF health check

Post by osx »

Getting close to 160k miles.

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Re: DPF health check

Post by GiveMeABreak »

According to the maintenance schedule on this engine, the particle filter should be checked at 112k - 120k miles, so you are well over that. This isn't to say it's at end of life necessarily, but is probably getting there....

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Re: DPF health check

Post by osx »

Checked with Diagbox or actually removing and checking it?

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Re: DPF health check

Post by GiveMeABreak »

The system uses the particle filter exhaust differential pressure sensors to check the pressure of the gasses going into (upstream) and out of (downstream) the particle filter. This is how the engine ECU knows when there is a blockage, when to start a regeneration cycle and such. If the downstream pressure is too high, then it may indicate a blocked filter as a result of it either being unable to regenerate for a particular reason, or because the filter is actually blocked by the deposits of Cerine, hydrocarbons, and other deposits that cannot be burnt off. It is these elements that lead to the progressive clogging of the particulate filter over its operating life.

Also, the amount of Eolys additive that is injected into the system is recorded, which it also uses to estimate when the filter is at end of life.

Diagbox can show you the pressures and the other data.

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Re: DPF health check

Post by osx »

So will have to run diagbox with the engine running? At what revs?

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Re: DPF health check

Post by GiveMeABreak »

You can see the status of the estimated remaining additive in the tank and the additive (in weight) injected into the filter from the injection ECU menu without the engine running.

You can also then run some live data on it by selecting the tests and running the engine. You just need to select the tests you want to run.

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Re: DPF health check

Post by osx »

Any of these numbers indicating condition of DPF? Soot weight and pressure difference are there.

https://www.frenchcarforum.co.uk/forum/ ... &mode=view

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Re: DPF health check

Post by osx »

Can it be true that there is so little soot after 160k miles?