GTD DPF Issues?

[gzmo]

Hi All,

So I have a 2014 MK7 Golf GTD, which is have a few issues.

I've not got any lights on dash, but you can feel the car isn't right. I've had the codes read and they come up;

P245200 Particulate Filter Pressure Sensor "A" Circuit
- This sensor has been replaced but the code still reappears.

P029900 Turbo/Super Charger Underboost
P00AF00 Turbocharger/Supercharger Boost Control "A" Module - Performance

I'm under the impressions the DPF is excessively clogged, Using the VAG DPF App I get,

Soot Mass Calc. (g) - 17.31
Regen Duration (min) - 0
Distance Since Last Regen (km) - 2
Time Since Last Regen (min) - 29
Oil Ash Residue (g) - 1.5
Low Press EGR Closing (%) - 100
DPF Input Gas Temp (`C) - 181
DPF Output Gas Temp (`C) - 149
Nox sulfur charge (g) - 11.385
Differential Pressure (IDLE) - 121 hpa
Differential Pressure (2500rpm) - 613 hpa

72% Overall on the App.

Would the codes etc be just because the DPF is clogged, but why no codes specifically for that?

 

[misor1994]

The differential pressures seem to be extremely high. They should be within the range approx. up to 15hPa in case the car is not right before the regeneration - in such case the pressure is a little bit higher. Either the differential pressure sensor is faulty or the dpf is clogged (it is a mechanical problem, not electric, so it will not show error code). You say that the sensor was changed - was it the differential pressure sensor?

 

[gzmo]

Yes, it was definitely the DPF Pressure sensor due to the code replaced. 2 pipes attached to it.

I think the DPF is clogged and causing all these other codes but I think your right mechanically it can't say the DPF itself, so goes to only thing that tells it it's clogged and that's the Sensor.

How would be best to clear out a DPF that can't regen or clean itself well enough?

 

[misor1994]

And was it a genuine one? I heard some complaints about the non-genuine sensors that they are often faulty. I changed this sensor only once and chose the genuine one and it worked without any issues. If you bought some aftermarket sensor, I think the chapest option at this moment would be to try the original one. The price is not horrific and this would confirm whether an issue is in the sensor or in DPF itself

 

[Jachas]

Some engine codes had TSB for DPF sensor. AFAIR, white sticker with black letters were faulty. TSB was giving exact part no, to replace old sensor. New ones had black sticker with white lettering

 

[gzmo]

A little update and the Fix in my case.

DPF Sensor was working fine both the original and the replacement, Replacement being a Hella Sensor.

The codes it was displaying was ultimately false in the issue, but correct for the reason, so the DPF sensor was reading DPF pressures excessively, I mean 1000+ hpa, at 3000 rpm.
Turbo was under boost due to the DPF also, blocking the flow of exhaust.

To clean the DPF, i just poured a bottle of the DPF foam cleaner, and waited for it to do its thing, then 3 litres of boiling hot water, all this in via the top lambda sensor.

Car wont start straight away, cylinder pressure is needed to push water further into the DPF. Once its done that it should start.

Exhaust will smoke, a lot, and the car will go into a regen itself, depending on your situation.

After a nice drive you will notice power back and the Stop Start working, and the rad fan not being on after shut down. Plus engine don't sound so loud any more.

To be clean the issue on my car was ASH blocking the DPF, you may notice the car was under the impression it was only 1.5 g.

Soot was under 7%.

New Levels
Differential Pressure (IDLE) - 44 hpa (Is still reducing, so not concrete)
Differential Pressure (Approx 3500+ rpm) - 741 hpa