P0401 P129F Dynamic air flow test c4 picasso 1.6hdi

[vincentfishing]

On normal driving my 2012 1.6hdi shows no faults on diagbox relating to airflow, however if I do dynamic testing on diagbox on airflow ,stationary ,engine warmed up the two faults show up ,see pics showing ref air flow 250 and actual 394.

any reason dynamic test shows fault but not when driving? Have changed maff x 3 times ,egr x3 and map, hoping this might be related to my c1391 fault.

[RichardW]

I can't answer, but I scanned my 3008 yesterday as I was having some handbrake trouble, and on checking in the engine I saw the same that air flow was around 400 vs a reference of 250 or so at idle, and the EGR was showing as closed. Occasionally I have a long crank, idle is slightly rough (but then it has been for the 50k I have had it!), and I thought very occasionally I could feel a bit of hesitation on cruise - our original C4 Pic did some of this when the EGR valve was sticking. Dunno, no lights on, I'm ignoring it!

[Mahmut +]

Merhaba aynı arızalar bende de mevcut. Sorunu çözebildinizmi?

[myglaren]

Please post in English.

Translation:-
Hello, I’m experiencing the same issues. Have you managed to sort it out?

Translated using DeepL.

[Paul-R]

This is an English language forum, please post in English. Use an on-line translator if necessary.

Hello, I have the same malfunctions. Did you solve the problem?

[Mahmut +]

Hi, I'm experiencing the same problems. Haven't you solved the issue yet?

[vincentfishing]

Found that as fault only came up on when on diagbox static test , never under normal driving conditions that it was just a abnormal revvingg condition on test that caused it ,cleared faults never did test again and never had faults again or ay driving issue , my c1391 fault wass totally unrelated to any engine /car problem, when i went into engine ecu using diagbox(which isnt scary or compplicated as some people make our) you get options to enable or disable everything ,i had a permanent abs/esr fault ,it turned out abs was disabled in ecu options, enabled it and all faults and lights cleared , suggest if you have diagbox and any faults that you cant clear before replacing parts check everything that should be working is enabled in engine ecu, another thing is i went to a ecu programmining /fault clearing company and they said it was abs ecu related and not engine as shown by codes, that was rubbish , all braking function options are within engine ecu..

[Mahmut +]

Thank you. I have a Diagbox device. Could you send me a screenshot of the engine ECU settings you mentioned, showing what needs to be worked on and what you've corrected? I'll try it right away.

[vincentfishing]

I did this months ago and have since deleted pics , it is pretty straightforward once youve selected engine ecu, there were a couple of times i just continued option when gibberish came up it then just moved on until i got a list up of options ,i actually i actually enabled three braking options one of which i wasnt sure i had ,when i came out and checked car my abs light was still on ,i went back in and disabled the 3rd unsure option and all my lights / errors dissapeared, car has been fine for long time since . I am old and useless on computers but found it was simple once i had discovered route into engine ecu,