DPF ash limit/capacity - Club Touareg Forums
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post #1 of 30 Old 09-24-2017 Thread Starter
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DPF ash limit/capacity

Can anyone tell me where I can find the specs for the DPFs built into Touareg TDIs, that tell me how much ash they can hold (ie. when they need to be replaced)?


I'm particularly interested in my 2008 R5 TDIs ash capacity, but pointing to any source where I can browse for the data in question will also be sufficient. If you don't know that either, but know your own Touareg's DPF ash capacity and/or at what ash load you had to replace your DPF because it was full, that would be also helpful.


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post #2 of 30 Old 01-18-2018
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post #3 of 30 Old 01-18-2018
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VCDS will tell you. The maximum ash load and the current ash load.

From a recent scan of my T3:

Mileage: 53318km-33130mi Repair Order:

Address 01: Engine (7P0 907 401 F)

17:52:52
390 Particle filter; oil ash volume 0.06 l (49409km - 0.06 l)
391 Particle filter; oil ash volume 16.9 g (15.8 g)
392 Particle filter; soot mass calculated 19.41 g (22.69 g)
393 Particle filter; soot mass measured 4.07 g (0.93 g)
395 Particulate filter ash load limit 327.67 g (327.67 g)

Previous: MY13 V6 TDI 4Motion,
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post #4 of 30 Old 01-21-2018
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I thought the V10 T1 limits were 150 g of ash with
soot reported as percent of duty cycle with a limit of 49%
Values are visible in group 068 or 075 of 01 and 011 for V10.
I know the R5 is just half a V10 so perhaps these numbers are useful.
I remember receiving a service update notice from VWOA that dpfs need replacement at 125k miles. Of course I will ignore that.

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post #5 of 30 Old 01-21-2018 Thread Starter
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Quote:
Originally Posted by lgibson View Post
I thought the V10 T1 limits were 150 g of ash with
soot reported as percent of duty cycle with a limit of 49%
Values are visible in group 068 or 075 of 01 and 011 for V10.
I've three values in group 068, and only one of them (the second one) is absolute, the others are in percents. That one reads 85 - so if your information is correct, this is the current ash amount, in grams, obviously. It seems to be fairly constant, even though in my latest scan it jumped to 85 from 84 (from >3000 miles ago) - another indication, that this might be indeed the calculated ash amount. I don't know how often it jumps, because the oldest log of that particular group I have is from about 3000 miles ago.

Group 075 show three temperature values (which I guess are the temperature sensors along the exhaust line) and a percent value (which seems to jump around wildly in different logs) - so that can't be the absolute ash amount.

Quote:
Originally Posted by lgibson View Post
I know the R5 is just half a V10 so perhaps these numbers are useful.
Yeah, but AFAIK V10s have two DPFs - a separate one for each cylinder bank. So, I assume 150 grams is the capacity of a single DPF. Because if it would be those of twos in total, then one would only have a capacity of 75 grams, and I should have already gotten a DPF full warning or something. Right?

Also, someone wrote here about his Touareg - without identifying the particular engine type and model year he had - that he got a printout from a dealership where his DPF's maximum ash capacity was indicated as 330 grams. So, that's also an indication for a single DPF for a 5-cylinder exhaust having a maximum ash capacity of at least 150-165 grams.

Quote:
Originally Posted by lgibson View Post
I remember receiving a service update notice from VWOA that dpf’s need replacement at 125k miles. Of course I will ignore that.
Can I ask what your calculated ash amount is in Group 068? Do you have a similar set of values in Group 075, too?
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post #6 of 30 Old 01-22-2018
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Yes, V10 has two ECUs with identical meauring blocks in 068 and 075. Block 068,1 is the same as 075,3 and indicates % of soot load as measured by the G450 and G451. It must be less than 50%. Active regen is triggered no later than 40-45%.
068,2 is grams of ash and must be less than 150 g. I do not know the algorhythm used for this calculation but mine does creep upward, perhaps a gram every three thousand miles as I am at 40 and 41 grams after 120k miles of mostly high speed interstate cruising. I have passive regens at around 2200 rpms when soot load drops to 0%.
These above parameters came from Dr Peter at Ross-tech.

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post #7 of 30 Old 01-22-2018 Thread Starter
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Thanks for the info. It was very helpful.
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post #8 of 30 Old 05-23-2019
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Quote:
Originally Posted by lgibson View Post
I thought the V10 T1 limits were 150 g of ash with
soot reported as percent of duty cycle with a limit of 49%
Values are visible in group 068 or 075 of 01 and 011 for V10.
I know the R5 is just half a V10 so perhaps these numbers are useful.
I remember receiving a service update notice from VWOA that dpfs need replacement at 125k miles. Of course I will ignore that.
Have a question here, though I posted it on "VAG COM Locator" forum too. In any event, wanted to know which menu option in VAG COM does one have to use to get the Ash and Soot values. I am currently using HEX+CAN Dongle and the Engine menu option Adv. Meas. Block button is grayed-out for me.

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post #9 of 30 Old 05-23-2019
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There are no advanced Measuring Values in the 2006. Gotta go to MVBs (

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post #10 of 30 Old 05-23-2019 Thread Starter
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Quote:
Originally Posted by TouaregNut View Post
Have a question here, though I posted it on "VAG COM Locator" forum too. In any event, wanted to know which menu option in VAG COM does one have to use to get the Ash and Soot values.
There's no dedicated function for that. You've to read the appropriate measurement block values (MVBs) to learn them. But those blocks are at different locations depending on the engine model.


Quote:
Originally Posted by TouaregNut View Post
I am currently using HEX+CAN Dongle and the Engine menu option Adv. Meas. Block button is grayed-out for me.
That means that you don't have a label file for the engine / control module, so, VCDS doesn't know what each particular MVB stores/means. (Well, I mean VCDS doesn't know them anyway, but if it can display a textual description along the field thanks to the label file, then at least you, the user will know what that particular MVB shows.)
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