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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: 2735

Is that one of these two?

Click image to enlarge

7th Jan 2024 3:06pm

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2735

Or perhaps this one, sensor circled in red and the tube in blue?

Click image to enlarge

7th Jan 2024 3:29pm

mmbanf

Member Since: 16 Mar 2021
Location: Milano
Posts: 174

hi Retroanaconda, were you able to solve the problem? thanks for sharing.

Marco

14th Feb 2024 7:29am

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2735

I’ll let you know at the weekend, picking the car up on Saturday evening.

15th Feb 2024 10:39pm

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2735

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.

19th Feb 2024 10:01pm

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2735

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

26th Feb 2024 6:34pm

91dm

Member Since: 26 Feb 2024
Location: Ireland
Posts: 35

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!

26th Feb 2024 10:11pm

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2735

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.

14th Apr 2024 9:33am

mmbanf

Member Since: 16 Mar 2021
Location: Milano
Posts: 174

great 90dv!!!, he found the problem straight away, however I'm glad you solved the problem. thanks for sharing.

Marco

15th Apr 2024 10:02am

91dm

Member Since: 26 Feb 2024
Location: Ireland
Posts: 35

That's good to hear.

Mine is going in this Friday for a full EGR valve and cooler change for P0401 code.

15th Apr 2024 8:10pm

91dm

Member Since: 26 Feb 2024
Location: Ireland
Posts: 35

Retroanaconda, has your fault come back since?

New EGR assembly didn't make any difference to mine.

24th Apr 2024 7:57pm

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2735

No, not yet - seems good so far.

25th Apr 2024 9:35am

91dm

Member Since: 26 Feb 2024
Location: Ireland
Posts: 35

Thanks Retroanaconda, hopefully can get to the bottom of my issue.

25th Apr 2024 10:06am

91dm

Member Since: 26 Feb 2024
Location: Ireland
Posts: 35

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.

4th Jun 2024 8:59pm

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2735

Excellent work - glad to see it can be done DIY easily enough. Suspect mine will need doing again in another 70k miles or so.

11th Jun 2024 6:29pm

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