Q7 3.0TDI cannot regenerate anymore

Hello everyone,

I'm having a small problem right now. To flush the DPF, you need to perform a regeneration cycle beforehand.
Unfortunately, I currently have a Q7 here that has only been moved from parking spot to parking spot for the past few months, and it's now displaying an error message indicating that it can no longer regenerate because the filter is full (with soot, not ash).

Unfortunately, I don't have access to an oven that gets hot enough to properly fire it.
Can the filter also be cleaned by burning it with a gas burner? Has anyone ever tried something like that before?
Or, does anyone have any ideas where I could find such an oven in the Rhine-Main area?

Sure, here's the translation:

"Thank you in advance!"

Best regards,
Christian

Hello Christian,

You can also find companies online that offer descaling and flushing as a service.
If the filter needs to be "foreign object"-free anyway, this is a good option.

Best regards, Rainer.

Is there no option for forced regeneration with VCDS on the Q7?
How much ash is already in the filter?

While this may not necessarily apply to the Q7, you can see how it's done in this link: /viewtopic.php?t=17091

Quote:

Is there a way to force a regeneration using VCDS on the Q7?

Yes, but even then, the load must not exceed a certain maximum value... otherwise, it will get too hot during the regeneration process.

Okay. I initiated the forced regeneration, but it stopped after a few minutes because the filter is too full (soot, not ash).

I need to check the ash content, but with 250,000 km on it, it's likely to be at the higher end of the range.

I was just wondering if I should try using the gas flame. The device should be able to withstand the heat, and if you hold it vertically, it should work. (No flame directly on the filter, but only in the tube).

It would be enough for me if it just got a little better, so that it can be reinstalled and regenerated.

A company would simply heat the filter (using an oven, for example).

Thank you very much!

Quote:

I was just thinking about whether I should try it with the gas flame.

You have nothing to lose. If it gets too hot, simply stop the air supply (blower/compressed air).

If it doesn't work or doesn't get hot enough, you can still give the filter away.

To be honest, my main concern was whether this would generate too much heat, or if I'm making a mistake somewhere.

Because burning with a flame costs almost nothing. (The gas costs are likely cheaper than the diesel costs for regeneration ).

I'll try it and let you know.

Thank you very much!

The carbon that burns in the DPF generates a lot of heat, which is great because: without combustion air, the reaction quickly comes to a standstill and is therefore easily controllable.

It would be a shame if you blew too much air and the ceramic or casing melted... then you would have to throw the thing away.

No, I won't blow on it at first (maybe in the second step), but I'll just use the flame. Since the chimney effect draws warm air upwards, there needs to be enough oxygen flowing in alongside the flame.

Thank you for the answers!
The Q7 is being returned due to further defects, so I can no longer conduct the test.
If I ever have another one with a clogged filter, I will report it here.

Okay, let's wrap things up here for now. Nevertheless, thank you for the feedback .