Yet another DPF/EGR/P0401/P2002 thread... dynamic EGR as mitigation?

[jwendorf]

Long time reader/first time poster, 2012 Jetta TDI Sportwagen 125K

CIL has been on and VCDS is reporting the ubiquitous P0401 and P2002 codes (see below). I have cleared the codes a few times and they come back after a few miles. I forced a standing regen just to see if it would help; prior to the regen calculated soot load was 11.1 and measured was 0.00. Post regen calculated was 3.3 and measured was 0.00. The regen had no impact on resolving the P0401 and P2002 codes. Reported Oil Ash Volume remains at 138ml.

Based on what I have gleaned from reading through this forum it seems likely the DPF is cracked and adversely impacting the EGR. I *think* the low measured soot on the DPF points to the DPF not being clogged, but the insufficient flow on the EGR means the DPF is letting the EGR get clogged likely due to a crack.

Assuming my amateur analysis is directionally correct it seems my options are:

1. pay dealer to replace DPF/EGR - very expensive (quoted ~4k) and future failure still a risk
2. pay local shop to delete DPF/EGR - still relatively expensive, increases performance (for offroading) and eliminates future DPF/EGR failure
3. DIY DPF/EGR delete - same as #2 but less expensive. I am mechanically capable of doing this work but do not currently have the time
4. ???

My question is whether there are other options I am overlooking? E.g. I know that there are tunes available with "dynamic EGR" that turns off the EGR once the car reaches operating temp. Would this help mitigate the issue at this point, or at least prolong the need to fix/replace the DPF and EGR?

Thanks in advance for any advice.

2 Faults Found:
001025 - EGR System
P0401 - 001 - Insufficient Flow - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 255
Mileage: 200973 km
Time Indication: 0
Date: 2018.12.23
Time: 18:32:53

Freeze Frame:
RPM: 2162 /min
Speed: 90.0 km/h
Voltage: 13.22 V
Load: 66.3 %
Load: 100.0 %
Mass Air / Rev.: 275.0 mg/str
Mass Air / Rev.: 300.0 mg/str

008194 - Particulate Trap Bank 1
P2002 - 007 - Efficiency Below Threshold - MIL ON
Freeze Frame:
Fault Status: 11100111
Fault Priority: 2
Fault Frequency: 1
Reset counter: 255
Mileage: 200978 km
Time Indication: 0
Date: 2018.12.23
Time: 18:37:07

Freeze Frame:
RPM: 1863 /min
Speed: 78.0 km/h
(no units): 81.6
(no units): 30.6
(no units): 2.75
Pressure: 326 mbar
Pressure: 28 mbar

Readiness: 1 1 0 0 0

 

[turbodieseldyke]

Taking the big assumption that Dynamic would solve your problem in the short term, you need to consider if any tuners for Dynamic EGR also do tunes for deletes. I.e., if you buy their dynamic tune, will they later give you a delete for a small extra charge? Or will you have to get a whole new tune from somewhere else?

The simplest thing you can do right now to fix the egr code is remove the egr filter pipe & clean it out.

 

[03Golfer]

Taking the big assumption that Dynamic would solve your problem in the short term, you need to consider if any tuners for Dynamic EGR also do tunes for deletes. I.e., if you buy their dynamic tune, will they later give you a delete for a small extra charge? Or will you have to get a whole new tune from somewhere else?

From experience, malone/tunezilla does not charge for changes except for the price difference between choices. If you're planning on tuning after hardware changes, no loss to tune beforehand to get dynamic egr.

 

[gmcjetpilot]

I posted the previous thread earlier in the week on this. I also have low ash load but was able to take a long drive (1500 miles) . I cleared the code and it did not come back.

I did a forced Regen of DPF while driving for good measures and might have been a mistake, I now have the thee 006744 - NOx Catalyst P1A58 - 000 - Regeneration Required Code. I also checked the tail pipe. Yes soot and even a bit oily. The car is running great with power. I will drive a bit more and see of the NOx clears or do a forced NOx Regen. I am pretty sure my DPF is toast.

Yes the solution options and cost you quote same as I got. I will likely do the work my self. I have see if dealer will sell me a DPF... I think it is $1700 plus $700 core.

 

[x1800MODMY360x]

CBEA/CJAA DPF info

Mods, please make this a sticky so I can easily point people here. When (not if) your CBEA or CJAA car flags the DTCs P2002, P0401, and sometimes P240F, and your car will have sooty tailpipes, YOUR DPF HAS FAILED. It is BROKEN. It cannot be cleaned. It will need to be replaced. This is the...

forums.tdiclub.com

 

[jwendorf]

Thanks for the replies here, needing to make a decision and still have some questions if anyone is willing to entertain them...

1. The car is currently being driven regularly with the CIL on and the error codes I shared above. The car seems to run as well as it ever has in the 5+ years we have owned it. Is that any kind of indication of the level of clog the EGR currently has? I.e. would/should I be experiencing drivability issues if the clog is severe?
   
   
2. Similar to #1, what is the actual long-term risk of doing nothing? Is the engine being damaged? Or will the EGR eventually clog to the point where the car is no longer drivable but can still be remedied with a new EGR/DPF system (or delete)?
   
   
3. If the clog is not too severe at this point would a combination of 'dynamic EGR' and 'dynamic idle' slow down or mitigate the problem? I asked this before but am still unclear on this.

thanks

 

[2.0TDmark]

I was watching if someone else would reply but I'll share my experience. I have a 2012 Jetta with a dsg. It's had the check engine light with P0401 and P2002 codes for at least the last 3k miles. It seems to drive fine although it's hard to get over 40mpg on the highway. It doesn't seem to regen much. It does go into limp mode if I drive it too hard. There's a code for egr or turbocharger overboost. I think the egr could be leaking somewhere. I do plan on deleting it soon.

 

[JonA]

Thanks for the replies here, needing to make a decision and still have some questions if anyone is willing to entertain them...

1. The car is currently being driven regularly with the CIL on and the error codes I shared above. The car seems to run as well as it ever has in the 5+ years we have owned it. Is that any kind of indication of the level of clog the EGR currently has? I.e. would/should I be experiencing drivability issues if the clog is severe?
   
   
2. Similar to #1, what is the actual long-term risk of doing nothing? Is the engine being damaged? Or will the EGR eventually clog to the point where the car is no longer drivable but can still be remedied with a new EGR/DPF system (or delete)?
   
   
3. If the clog is not too severe at this point would a combination of 'dynamic EGR' and 'dynamic idle' slow down or mitigate the problem? I asked this before but am still unclear on this.

thanks

1. No, if doesn't tell you anything. And it's not just the EGR, it's the DPF as well.
2. Unless you plan to delete, you risk damaging the NOx catalyst I believe, possibly other emissions control components.
3. Dynamic EGR won't do anything to slow down or mitigate the problem at this point.

The thread posted by @x1800MODMY360x is worth a close read. Check your tail pipe. It should look practically brand new If there is any soot on it at all, your DPF is cracked and the only fixes are replacement of the DPF, EGR filter, etc... as outlined in that thread, or a delete + tune.