Citroen C4 1.6 HDI error P11AA

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

studiomav
Posts: 2
Joined: 28 Jul 2022, 08:39

Citroen C4 1.6 HDI error P11AA

Post by studiomav »

Hi everyone, I ask you for a problem with my Citroen C4 1.6 HDI,
for a few months in random mode the SERVICE warning light comes on and the machine goes into protection mode
with rev limiter, just turn it off and on again and everything works, and the problem always reappears after 50/200 kilometers.
When diagnosing BOSCH, the error "P11AA - Supercharging pressure sensor - Maximum value exceeded" is displayed
the turbo pressure sensor on the manifold was changed, but nothing to do after a few kilometers the problem again;
the turbo boost solenoid valve was changed, but nothing to do after a few kilometers the problem again;
the entire turbine was disassembled, checked by a competent center they said that it had nothing and no need for overhaul, but nothing to do after a few kilometers the problem again;

I do not know what to do ....
User avatar
Paul-R
(Donor 2020)
Posts: 5795
Joined: 07 May 2009, 16:24
x 930

Re: Citroen C4 1.6 HDI error P11AA

Post by Paul-R »

The first thing that Marc will ask for is the VIN of the C4. If you post it here it will be automatically masked from public view and only available to staff members.
User avatar
GiveMeABreak
Forum Admin Team
Posts: 28952
Joined: 15 Sep 2015, 19:38
x 3595

Re: Citroen C4 1.6 HDI error P11AA

Post by GiveMeABreak »

Generally speaking that fault as it relates to the turbo can have the following possible suspects:
  • Inlet air pressure and temperature sensor
  • Electrical harness
  • Connectors
  • Turbocharger position copy sensor
  • Turbocharger control solenoid valve
  • Turbocharger
  • Air mixer unit
  • Oil vapour recirculation circuit heater
  • Turbocharger pressure regulation pneumatic control
  • Crankcase breather system
  • Inlet valve
  • Non return valve
  • Air inlet manifold
This fault can also relate to an air leak at the canister solenoid valve, from the canister solenoid pipe or from the snap-on connection on the inlet air manifold (especially if it has been serviced recently an may not have been put back properly).
studiomav
Posts: 2
Joined: 28 Jul 2022, 08:39

Re: Citroen C4 1.6 HDI error P11AA

Post by studiomav »

Thanks for all the info, I will report to my mechanic, and it will be my care to inform you about the implications. Thanks again