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DS4 1.6 e-HDi 9HR/DV6C – rough running, much better with MAF disconnected	Please Register to enjoy additional Member Benefits

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busuioc_gabriel

Mon Jun 29 2026, 07:04am

Member No: #63633

Joined: Jun 29 2026

Hello everyone,

I have a 2012 Citroën DS4 with the 1.6 e-HDi / HDi 112 hp engine, engine code 9HR / DV6C.

I have been chasing an intermittent rough running issue for some time. The engine starts immediately, but especially when cold it may shake for 1–2 minutes. The main problem appears during transitions: pulling away from traffic lights, light acceleration after slowing down to 30–40 km/h, or gentle acceleration after changing gear. At steady speed the engine runs very well.

I have done several checks with Diagbox and an Autel scanner. The most interesting result is this: when I disconnect the MAF / air flow sensor, the car runs almost perfectly. The hesitation and jerking almost disappear. Of course, with the MAF disconnected I get the expected MAF-related faults, such as P0102 and P0113, and the ECU goes into fallback mode with measured air flow = 0.

When I reconnect the MAF, the rough running comes back.

I also noticed something suspicious. The large corrugated intake hose fitted just after the MAF body moves quite easily on the MAF housing. There is no metal clamp there. I looked at pictures of a compatible VDO/Continental MAF, and the long neck where the hose fits seems completely smooth, with no groove for an O-ring.

My question is:

On this 1.6 e-HDi / DV6C engine, is it normal for the large intake hose after the MAF to be simply push-fitted without a clamp and without a visible O-ring? Should it move quite easily, especially when warm, or should it be tight on the MAF body?

The hose seems to correspond to PSA part number 9683725080. I am wondering if the hose may be old, hardened or enlarged, allowing unmetered air after the MAF and disturbing the EGR/injection strategy.

Has anyone had a similar issue on a DS4 / C4 II / Peugeot 1.6 HDi DV6C?

Thank you.

Ap0qalypto Serbia and Montenegro

Mon Jun 29 2026, 09:29am

Member No: #52161

Joined: Sep 21 2018
Location: Republic of Serbia

Once you disconnect MAF, ECU is using average values. Since it is running fine then, you definitely have MAF issue. There should be a ring or something to hold the hose

1 User said Thank You to Ap0qalypto for this Post :
busuioc_gabriel (29 Jun 2026 : 10:11)

busuioc_gabriel

Mon Jun 29 2026, 10:16am

Member No: #63633

Joined: Jun 29 2026

yes, unfortunately Citroen did not choose the safest option for this connection between the hose to the turbo and the MAF body - there is no metal clamp... the rubber hose has a hard collar and some gaskets inside - I can't tell if the gaskets are in good condition or if they still leak from time to time - it still seems to me that the hose moves a little easily if I try to pull it out... the problems are intermittent - there were cases where I drove 500...600km perfectly and suddenly it started to jerk

Ap0qalypto Serbia and Montenegro

Mon Jun 29 2026, 01:26pm

Member No: #52161

Joined: Sep 21 2018
Location: Republic of Serbia

You can try cleaning MAF for a start


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