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Home > Faults & Fixes (L663) > P0401 - EGR flow insufficient
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2656
Scotland 
Is that one of these two?


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Post #1020383 7th Jan 2024 2:06pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2656
Scotland 
Or perhaps this one, sensor circled in red and the tube in blue?


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Post #1020390 7th Jan 2024 2:29pm
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mmbanf



Member Since: 16 Mar 2021
Location: Milano
Posts: 166
Italy 
hi Retroanaconda, were you able to solve the problem? thanks for sharing.

Marco
Post #1024665 14th Feb 2024 6:29am
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2656
Scotland 
I’ll let you know at the weekend, picking the car up on Saturday evening.
Post #1024825 15th Feb 2024 9:39pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2656
Scotland 
Problem seemed to have been solved, though I’m not 100% convinced yet that there is not still some hesitation on occasion. It is certainly much improved though.

However the P006B-64 fault is still present in the ECU after a drive.
Post #1025238 19th Feb 2024 9:01pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2656
Scotland 
Definitely not solved - problem now back as bad as before and P0401 fault also now showing along with the warning light again.

Back to the dealer we go Rolling Eyes
Post #1026049 26th Feb 2024 5:34pm
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91dm



Member Since: 26 Feb 2024
Location: Ireland
Posts: 33
Ireland 
I have this exact issue for the last four weeks.

Same P0401 code and hesitation/judder at 1200-1500rpm, worse on inclines. It's better driven in S keeping the revs up.

Is it a cracked pipe / leak off somewhere? I think the EGR code is misleading LR?

Mine is also going in for a new EGR. Good to know I'm not alone with this issue, first issue I've had.

Thanks!
Post #1026084 26th Feb 2024 9:11pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2656
Scotland 
The dealer replaced the exhaust manifold pressure sensor and its feed tube on Friday, and having done 300 miles home I am hopeful that it has been sorted. Fingers crossed it stays sorted.
Post #1031485 14th Apr 2024 8:33am
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mmbanf



Member Since: 16 Mar 2021
Location: Milano
Posts: 166
Italy 
great 90dv!!!, he found the problem straight away, however I'm glad you solved the problem. thanks for sharing.

Marco
Post #1031604 15th Apr 2024 9:02am
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91dm



Member Since: 26 Feb 2024
Location: Ireland
Posts: 33
Ireland 
That's good to hear.

Mine is going in this Friday for a full EGR valve and cooler change for P0401 code.
Post #1031696 15th Apr 2024 7:10pm
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91dm



Member Since: 26 Feb 2024
Location: Ireland
Posts: 33
Ireland 
Retroanaconda, has your fault come back since?

New EGR assembly didn't make any difference to mine.
Post #1032709 24th Apr 2024 6:57pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2656
Scotland 
No, not yet - seems good so far.
Post #1032782 25th Apr 2024 8:35am
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91dm



Member Since: 26 Feb 2024
Location: Ireland
Posts: 33
Ireland 
Thanks Retroanaconda, hopefully can get to the bottom of my issue.
Post #1032785 25th Apr 2024 9:06am
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91dm



Member Since: 26 Feb 2024
Location: Ireland
Posts: 33
Ireland 
A big thanks to Retroanaconda for starting this thread, saved me a lot of time! This was also the problem with mine, here's some pictures to help others:

Symptoms I had:
>P0401 EGR insufficient code that would return every 50 miles or so after clearing codes
>Hesitation / stutter at around 1200rpm which was more noticeable when the engine was under load, almost like someone switched the engine off for a second
>Little mid range power, very flat acceleration

Fix
>Clean out the metal pipe from the exhaust manifold to the exhaust pressure sensor

Here's some pictures:

Code on diagnostic:


Click image to enlarge

Pipe is located behind this boost pipe.


Click image to enlarge

I also replaced the MAP sensor which seem to bring back the mid range power however the low rev issue was still present and P0401 code.


Click image to enlarge

MAP part number


Click image to enlarge

This is the pipe and sensor


Click image to enlarge

Access is quite tight so I managed to clean the pipe by feeding wire up from the manifold side. You can see the dry carbon coming out.


Click image to enlarge


Over 600 miles done since without any engine light.

Hopefully that helps others.
Post #1036511 4th Jun 2024 7:59pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2656
Scotland 
Excellent work - glad to see it can be done DIY easily enough. Suspect mine will need doing again in another 70k miles or so.
Post #1037150 11th Jun 2024 5:29pm
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