2.0 Diesel 190 DPF Troubleshooting

[jdragon]

Doing a scan yesterday after some coding with VCDS brought up the following error code and measure values from the DPF (no amber DPF warning light on the dash):

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Monday,11,April,2022,18:21:34
Mileage: 113739km-70674miles

1 Fault Found:
19226 - Particulate Trap Bank 1
P2002 00 [101] - Efficiency Below Threshold
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 113721 km
Date: 2022.04.09
Time: 09:51:43


Engine RPM: 1217.50 /min
Normed load value: 26.7 %
Vehicle speed: 22 km/h
Coolant temperature: 90 °C
Intake air temperature: 55 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 14.940 V
Unlearning counter according OBD: 40
Exhaust mass flow of low-pressure EGR: calculated: 3.986
Differential pressure ratio: low-pressure EGR: 20.5 kg/h
Exh.recircul. 2: differential pres.sensor 1 bank 1: adap. value: 19.9 hPa
Exhaust recirculat.2: different.press.sens.1 bank 1: raw value: 16.2 hPa
Exh.recircul.valve 1 bank 1: pos.feedback - Actual value: 83.87 %
Exhaust recirc.valve 2 bank 1: posit.feedback - Actual value: 31.54 %
Exh. gas recirc. 2: diff. press. sensor 1 bank 1: dyn. value: 20.5 hPa

Measuring blocks immediately after:
IDE00430-ENG57549 Particle filter: field regeneration request status-Bits 0-7 0
IDE00432 Particle filter: time since last regeneration 4.287 H
IDE00434 Particle filter: soot mass calculated 17.77 g
IDE00435 Particle filter: soot mass measured 4.76 g
IDE00436 Particle filter: kilometers since last regeneration 277.2 km
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Some internet research led me to going for a drive at 2-2500RPM (basically 60mph in 4th gear) for >20 minutes to burn some build up off the DPF. That didn't work, so I followed the support on the Ross-tech website and did a regeneration at idle for UDS.

http://wiki.ross-tech.com/wiki/index.php/Diesel_Particle_Filter_Emergency_Regeneration

When the process had completed after about 12 minutes, I did another scan and measured the values again.

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Monday,11,April,2022,19:56:17
Mileage: 113808km-70717miiles

1 Fault Found:
19226 - Particulate Trap Bank 1
P2002 00 [101] - Efficiency Below Threshold
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 113749 km
Date: 2022.04.11
Time: 18:21:54


Engine RPM: 2392.50 /min
Normed load value: 35.3 %
Vehicle speed: 95 km/h
Coolant temperature: 91 °C
Intake air temperature: 92 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 14.780 V
Unlearning counter according OBD: 40
Exhaust mass flow of low-pressure EGR: calculated: 4.458
Differential pressure ratio: low-pressure EGR: 41.9 kg/h
Exh.recircul. 2: differential pres.sensor 1 bank 1: adap. value: 67.1 hPa
Exhaust recirculat.2: different.press.sens.1 bank 1: raw value: 65.1 hPa
Exh.recircul.valve 1 bank 1: pos.feedback - Actual value: 71.35 %
Exhaust recirc.valve 2 bank 1: posit.feedback - Actual value: 79.32 %
Exh. gas recirc. 2: diff. press. sensor 1 bank 1: dyn. value: 71.8 hPa


Measuring blocks immediately after:
IDE00430-ENG57549 Particle filter: field regeneration request status-Bits 0-7 0
IDE00432 Particle filter: time since last regeneration 0.086 H
IDE00434 Particle filter: soot mass calculated 5.48 g
IDE00435 Particle filter: soot mass measured -5.90 g
IDE00436 Particle filter: kilometers since last regeneration 0.0 km
IDE06059 Particulate filter: oil ash mass 27.3242038 g
IDE06060 Particulate filter ash load limit 80.000 g
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Why does it think the soot mass measured is now negative. Is this typical following a regen?

Also, the EGR values are a mystery to me. What do the % mean?

I didn't log the oil ash mass initially, but it went up by ~0.005g

I haven't driven the car yet, so I'll do this later (need to collect a heat gun from Screwfix which is about 10 minutes from my house) so I'll complete another scan out of curiosity.

Any help/nudge in the direction to understanding the output from the regen/if something else needs investigating would be much appreciated.

[jdragon]

Issue resolved.

P2002 00 is a fault caused by a blocked EGR Cooler, which has since been replaced and the car no longer shows the error

[Audid]

Issue resolved.

P2002 00 is a fault caused by a blocked EGR Cooler, which has since been replaced and the car no longer shows the errorHi thanks for the update. Having the same issue on my A5. How much did the replacement cost? I am getting 2.3k from Audi!! Thanks.

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[jdragon]

Hi thanks for the update. Having the same issue on my A5. How much did the replacement cost? I am getting 2.3k from Audi!! Thanks.

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£1k using OEM parts at a VAG specialist

I was fortunate that the warranty I had buying the car second hand covered 60% of the cost

[Audid]

Thank you for the response. I guess its some good news that Audi took some responsibility - Were there any particular factors, do you know?

Did they pay out the 60% to you? I'd have thought it'll only have to be at dealership service centres.

My car still has extended warranty too. Going through Audi UK to see if they can help cover. Should get a response by next Wednesday. Cheers.

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[jdragon]

It was done at a VAG specialist, not Audi.

The warranty wasn't Audi either.

What do you mean by "Were there any particular factors, do you know?"

The EGR cooler was blocked and needed to be replaced. That's it really.

[Crasher]

Having a measured value show negative after an active or service regeneration is entirely normal.

[Audid]

It was done at a VAG specialist, not Audi.

The warranty wasn't Audi either.

What do you mean by "Were there any particular factors, do you know?"

The EGR cooler was blocked and needed to be replaced. That's it really.Thanks.

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