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Discussion Starter · #1 ·
For the second time in 2 weeks, my engine management light came on, I checked the codes and a P040B00. Exhaust gas recirculation valve temperature sensor A was displayed. I spoke to my local audi specialist that stated its more likely the EGR is at fault with a hefty sum of £1400 to replace!! I've reset the codes but I'm aware this isn't going to solve the issue but inevitably delaying it considering its came up for the second time. My Car is still under audi's used car warranty, would this be covered? Is this part accessible and easy to replace? For a quote of £1400 I'm guessing it's a big job.

Any help appreciated.
 

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Discussion Starter · #3 ·
If you bought from Audi it will be covered. If an inde, go ask him.

You could try cleaning egr
Thanks, it was bought from Audi main dealer in July 2020 under their 2 year used car warranty. I have seen many companies offering a EGR clean, terraclean etc... are they worth it? Has anyone tried them on here with positive experience?
 

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I did carbon clean, in the hope it might delay EGR & DPF repair / replacement. I was pleasantly surprised when I noticed the engine was a little smoother afer.
 

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I too have had a terraclean, plus I bought two cans of specialist egr cleaner and sprayed them into the inlet manifold. I have not had any egr fault codes since.
 

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I think if you are going to have a carbon clean / terraclean done, have some EGR / intake cleaner to spray afterwards, as I suspect a lot of gunk is released in this process back into the inlet manifold, and you want to try and flush/clean it out as it gets recirculated by the EGR. Then best to have an oil and filter change as a lot of the gunk and deposits will end up there!

Suspect you are also not driving the car much, and only short journeys which is not good. Take the Q5 out for a good 30min motorway blast every now and then, and especially after carbon clean, EGR spray etc, to get high engine and DPF temperatures to try burn off as much as possible.

I have been using and would recommend Liqui Moly Pro Line Diesel System Cleaner (500ml), in a full tank of diesel fuel. Helps clean the whole system, after that I plan to use Liqui Moly Super Diesel Additive (250ml) per tank of fuel for occasional maintenance.
 

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Discussion Starter · #7 ·
I think if you are going to have a carbon clean / terraclean done, have some EGR / intake cleaner to spray afterwards, as I suspect a lot of gunk is released in this process back into the inlet manifold, and you want to try and flush/clean it out as it gets recirculated by the EGR. Then best to have an oil and filter change as a lot of the gunk and deposits will end up there!

Suspect you are also not driving the car much, and only short journeys which is not good. Take the Q5 out for a good 30min motorway blast every now and then, and especially after carbon clean, EGR spray etc, to get high engine and DPF temperatures to try burn off as much as possible.

I have been using and would recommend Liqui Moly Pro Line Diesel System Cleaner (500ml), in a full tank of diesel fuel. Helps clean the whole system, after that I plan to use Liqui Moly Super Diesel Additive (250ml) per tank of fuel for occasional maintenance.
Thanks for the reply.

I was wondering where the gunk would end up after a egr terraclean.

I drive a 60 mile round trip commute each day consisting of dual carriageway and B roads, it certainly gets a decent blast most days.
 

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Where does it end Up? Well most terraclean reports record lots of smoke out the exhaust. Mine none, and never has had a hint of smoke unlike any other diesel I have driven. So the exhaust dpf works...... So I guess the deposits go into the dpf for regen. (Always wondered about the fan noise for up to 8 minutes after parking). Never had a problem with mine until obvious oil overfill at service. Became apparent after long high speed run...oil burnt off = egr fault.
Use correct oil and make sure never filled to max (as could be over at that point).
 

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Discussion Starter · #9 ·
Where does it end Up? Well most terraclean reports record lots of smoke out the exhaust. Mine none, and never has had a hint of smoke unlike any other diesel I have driven. So the exhaust dpf works...... So I guess the deposits go into the dpf for regen. (Always wondered about the fan noise for up to 8 minutes after parking). Never had a problem with mine until obvious oil overfill at service. Became apparent after long high speed run...oil burnt off = egr fault.
Use correct oil and make sure never filled to max (as could be over at that point).
My Car was serviced In July, the oil fill was below the max mark, it was running fine till 2 weeks ago when i got the fault P040B00 code.

I'm going to try a terraclean EGR clean first then see how it goes. I've noticed my car was running a bit rough today, not as smooth as before.
 

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I wasn't meaning all of the gunk ends up in the inlet manifold, just that it also loosens some of the gunk in the EGR, hopefully most of the shifted gunk gets burnt off in the engine and DPF, hence get engine nice and hot before and after carbon clean to help the process. Shortly after my carbon clean, my inlet manifold got gunked up, could have been coincidence. EGR system is such a stupid idea!!
 

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this happened to myself a few weeks ago emission control light came on had to take it back to arnold clark and they put in a new EGR valve, amazes me they didnt notice it when servicing and MOT'd the car just a fortnight prior before i bought it really hampered my MPG but has been great since, its a really common problem with audi 2.0 tdi's
 

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I wasn't meaning all of the gunk ends up in the inlet manifold, just that it also loosens some of the gunk in the EGR, hopefully most of the shifted gunk gets burnt off in the engine and DPF, hence get engine nice and hot before and after carbon clean to help the process. Shortly after my carbon clean, my inlet manifold got gunked up, could have been coincidence. EGR system is such a stupid idea!!
That is why after my terraclean I sprayed specialist egr cleaner directly into the inlet manifold.
 

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Discussion Starter · #13 ·
Thanks for the replies. Well my EML light came on again last night, my partner is taking it to Audi tomorrow and will hopefully get a decision then or soon after if its covered under warranty. If not, then it's down the route of a clean. See if that'll clear it.
 

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Discussion Starter · #14 ·
My partner took the SQ5 to Audi.... didn't even look at it, or check the codes, just booked it in for the 16th September for 2 days... then after being asked if its covered under warranty, they tried to change the date to end of October unless she wanted to pay £180 for a "priority" booking on the 16th September? Is it normal for Audi to charge for a priority booking. Needless to say, it's booked in for the 16th and I'm not paying anything!
 

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Normally Audi are pretty decent to deal with, I've heard and personally dealt with a lot of garages trying to run out the warranty period or claim its not covered, As its a known fault with the cars and engines it should be covered under there warranty but to not take the 10 minutes it takes to plug in VCDS to give it a rough diagnosis is a joke, a DIY clean of the valve is easy enough plenty of videos online as a replacement EGR valve is £4-500 plus
 

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Discussion Starter · #16 ·
Normally Audi are pretty decent to deal with, I've heard and personally dealt with a lot of garages trying to run out the warranty period or claim its not covered, As its a known fault with the cars and engines it should be covered under there warranty but to not take the 10 minutes it takes to plug in VCDS to give it a rough diagnosis is a joke, a DIY clean of the valve is easy enough plenty of videos online as a replacement EGR valve is £4-500 plus
Yeah that's what I thought. They didn't even bother looking at or read the ecu, they've just decided to book it in for 2 days. She told the it was the EGR or something and they just booked it in. Yeah I've seen plenty of companies that clean these things, but thought, why pay £100 - £150 to get it cleaned when it's still under warranty and let it be Audis problem.
 

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They wont clean it they'll put in a new one took Arnold Clark two days to put a new one in mine with a day of that actually waiting on the part, hopefully they don't give you more hassle £180 to get a priority slot is crazy though, what did they say when you argued back
 

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Discussion Starter · #18 ·
They wont clean it they'll put in a new one took Arnold Clark two days to put a new one in mine with a day of that actually waiting on the part, hopefully they don't give you more hassle £180 to get a priority slot is crazy though, what did they say when you argued back
We just said that you have the slot available so why should we pay for it.
 
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