Anyway get a remap ask them to map the EGR closed, job done

 

The EGR is part of the DPF regen cycle, removing it signs a death warrant for the DPF.

 

Death! [emoji23] so your saying during a regen when it needs to be hot opening the EGR valve so the combustion is colder helps the regen.
If the EGR has failed and is stuck open then the regen won't work you mean.
Having it mapped out drastically reduces the amount of particulates produced and means all regenerations will be successful unless you stop driving.

 

During the active regeneration period:


.The turbochargers are maintained in the fully open position to minimize heat transmission from the exhaust gas to the turbochargers and to reduce the rate of gas flow through the particulate filter. This enables optimum heating of the particulate filter. If the driver demands a higher torque the turbochargers will respond by closing the vanes as required.


.The throttle is closed as this assists in increasing the exhaust gas temperature and reducing the rate of exhaust gas flow,


both of which increase the speed at which particulate filter is heated.


.The exhaust gas recirculation (EGR) valve is closed as the use of EGR lowers exhaust gas temperatures and therefore makes it difficult to achieve the regeneration temperature in the particulate filter.


.The glow plugs are sometimes activated to provide additional heat in raising the temperature of the particulate filter. To maintain glow plug serviceability the activation period of the glow plugs is restricted to 40 seconds.

 

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.

 

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

 

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.

 

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.

 

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.

 

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

 

 

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

 

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

 

Standard letter.

 

Light on today, back for sure...

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

 

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.

 

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?

 

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

 

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?

 

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.

 

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?

 

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

 

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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Mine just went in for MOT, I'm convinced they ran a cleaner through. She was a little rough for the first mile or and then back to normal, it was only an MOT and it went straight through no problem... [emoji848]

 

Error popped up on the dash about 3 weeks ago, cleared it. Been completely quiet ever since. Fully expecting it come back in the summer

 

had same problem new EGR valve fitted but after 24 hours and 100 miles light back on dealer said it was EGR cooler they replaced this FOC

 

Yup, I mention earlier in the thread the cooler is th problem, not the valve.

 

Posted on another tread, I've had this code on off your 2 years, keep clearing it, took inlet off to check the egr, looked like the hole in inlet where flexi pie joins was blocked, cleaned up everything. No codes if a month now & feels smoother. Dam cheaper than new egr or cooler

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