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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: 2557

Is that one of these two?

Click image to enlarge

7th Jan 2024 3:06pm

Retroanaconda

Member Since: 04 Jan 2012
Location: Scotland
Posts: 2557

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: 131

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: 2557

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: 2557

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: 2557

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: 10

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: 2557

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: 131

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: 10

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: 10

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: 2557

No, not yet - seems good so far.

25th Apr 2024 9:35am

91dm

Member Since: 26 Feb 2024
Location: Ireland
Posts: 10

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

25th Apr 2024 10:06am

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