arenosharvista

I tried Emergency regeneration on my Audi A6 C6, 2.7 tdi (132Kw, Quattro), the regeneration was running smoothly for about 12 minutes, reached stage 82 out of 100 and out of sudden revs dropped till idle, regeneration procedure stopped. Checked MVB 100, Emergency regen. Abort detected =1. Has anybody any idea of what could have caused that?

Before regeneration:
Group 104: Particulate filter
0.55 Oil ash [Ltr]
10.5 Soot mass calculated [g]
1.0 Soot mass measured [g]
100 km distance driven since the last regeneration [km]
After regeneration:
Group 104: Particulate filter
0.55 Oil ash [Ltr]
11.0 Soot mass calculated [g]
2.0 Soot mass measured [g]
100 km distance driven since the last regeneration [km]

Group 007: Temperature sensor
35.1°C Fuel temperature
83.7°C Oil temperature
35.1°C Intake air temperature
83.7°C coolant temperature

SchwarzS6

From what I have read the soot load is computed two ways. One from driving style, exhaust gas temps an the O2 sensor and the other based on exhaust temps, exahust pressure and exhaust mass based on ECM computations.

During regen you need to drive at a constant speed under some load to keep exhaust temps up, you cannot idle. If you shut the car down or get stuck in traffic the regen wont complete. At some point the car will give up and you will have to take it to the dealer and they can do a special high temp regen in the shop.

Having said all of this, I do not think your soot load is high. According to VW the soot load for a regen of the 2.0 TDi is 18 g and I think the 2.7 is similar. You only have either 10 or 2 depending on whether you look at computed or measured and you have a larger engine. Where you are in trouble is your ash load. The max is 0.52 litre and you exceed this value. You may need a new particulate filter. See this thread:

DPF - Limp mode - Audi A5 Forum & Audi S5 Forum