[Eamonn]

The EGR is part of the DPF heat management, not having it can cause aborted regens or in some cases overheat the DPF. Removing it is a DPF death sentence.

 

[cjamesenorf]

Ok if that's what you've been told [emoji106]

 

[Eamonn]

What you're quoting is a general overview of most common DPF/EGR setups. Not this one in particular. There are several people on here that have removed their EGR, and very shortly had the DPF die. I have also been told by several VAG tuning garages and VAG techs that removing the EGR without removing the DPF is a very bad idea.

Regardless, even if I did remove/disable the EGR, it doesn't solve the fault, it just removes the function.

 

[A5driver]

I once looked into having the egr coded out, and they indeed code it in a way that the egr will only be active while the DPF is regenerating.
I'm sure it can be fully coded out and still have a DPF, but then its likely to cause problems.

In the meantime i'm still getting the p0401 code every other week or so, i'm keeping an eye on this thread to see if Eamonn's issue with the egr stay fixed for a month or two, then I'll order the egr+cooler and have some independent garage fit it for me and be done with it for hopefully another 60K miles.

 

[Eamonn]

Few weeks in and still clear, I haven't seen it since. Might be worth noting I never actually got a dash light since, only a pending error which quickly cleared itself.

 

[Eamonn]

Reappeared as pending today... No dash light yet.

 

[cjamesenorf]

 

[Eamonn]

I haven't had any 'technical measures', afaik they've only hit 2.0TDIs yet

 

[Eamonn]

What is this letter? Them replying to your complaint? Or a standard thanks we did the update letter?

 

[Eamonn]

Light on today, back for sure...

What the hell else could it be? What sensors or other pipework can I replace?

 

[A5driver]

I'm still thinking the G450 (dpfe sensor) that sometimes gives a wrong reading or maybe some vacuum leak.
I noticed my p0401 fault is most likely to be logged between 10-15 minutes of (city)driving

While inspecting that sensor (it's bolted on the big plastic hose that goes from your airbox to the turbo), I noticed some mixed oil/soot on a hose near the turbo, perhaps one that also goes to the egr cooler.
(red = contaminated parts, green = dpfe sensor)

Car needs to go in for service next month and will have the dealer take a look at it, I'm not having the valve or cooler replaced just yet ... I think i have the exact same issue as you.

 

[Eamonn]

I have read that the EGR/DPFE temp sensor is used to measure EGR flow, could be an easy fix? Any idea on the part number?

 

[Eamonn]

Here's a snap of mine, same place for reference.

 

[A5driver]

thanks!
your pipes look cleaner, just a little bit of gunk in the area around the clamp of the big plastic hose ... (for mine that's almost 9 years worth of accumulation)
just strange because normally only clean air is supposed to go around in that area.

Today i've done a "reset learned values of the dpfe" in vcds ... just trying some things

 

[Eamonn]

thanks!
your pipes look cleaner, just a little bit of gunk in the area around the clamp of the big plastic hose ... (for mine that's almost 9 years worth of accumulation)
just strange because normally only clean air is supposed to go around in that area.

Today i've done a "reset learned values of the dpfe" in vcds ... just trying some things

Interesting, I might try that too as I have a new EGR. Do you reckon it's worth replacing the sensor or waiting to see if a value reset sorts it? Where was the option might I ask?

 

[A5driver]

01-Engine > Basic Settings- 04
Addaptation of diff. pressure sensore particulate filter
GO!
and then it will say "Finished correctly"

and then apparently keep the ignition off for at least 10 secs

The sensor isn't an expensive part (£30 for a replacement bosch), and seems like an easy/quick DIY job
It does seem to be a part that goes bad easily. Always sucks to pay for replacement parts not knowing if it will fix your problem or not.

What botters me is that the p0401 code often means something is clogged, but I figure if it's really clogged, the code should come back almost instantly after removing it ... it can't be clogged on one day and not clogged for the next week or so.
I'm hoping for a faulty sensor or cracked hose somewhere to be the cause of it.

 

[Eamonn]

That would make sense and it's what worries me, I had a few weeks clear so replacing the entire EGR helped somehow. Reckon the sensor might still be to blame?

 

[cjamesenorf]

What is this letter? Them replying to your complaint? Or a standard thanks we did the update letter?

Standard letter.

 

[Eamonn]

Update, haven't done anything to it, keeps coming and going, but hasn't been on the dash since.

 

[sbones]

Mind of their own, a year ago I had eml on, cleared & come back on week later. No limp so just kept clearing, 6 months later, stopped coming on & no eml, been clear for last 6 months touch wood

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