Fault Code P11AA 508 2.2
General meaning:
Turboboost pressure lower than expected
Turboboost pressure higher than expected

Given you had the sensor replaced, unlikely to be the cause, but the above is the tests for it. The next possible cause is an air leak, often missed one is the o-ring on the dipstick.

 

Hi
Sorry to sound dumb but what dipstick, I'm no good with cars, I seem to be struggling to find a garage who does smoke testing for leaks

 

You're looking for un-metered air entering the system. That o-ring can do it, and it can be intermittent. Anywhere after mass air flow meter along air intake, is the obvious, but this one gets missed all the time.

 

Thank you appreciate that, I'll have a look and see if I can see or here anything while I'm waiting on couple local garages getting back to me.

Will I be damaging the car if I still drive it obviously I don't drive like an idiot anyway

 

Well I wouldn't be doing any rally driving till you work it out the cause, in case it was a turboboost over pressure, but inclined to think it's turboboost lower than expected warning. Particularly if you're not really under boost when the error does happen.

A split in air-intake hose, a small one, might also be a source.

 

Yeah definitely none of that haha. Most of the times its happened it's just been either cruising along or pulling away from a junction but never have I hard accelerated

 

Hello everyone, i have the same problem but with 2.0L HDI 163 engine; changed the electro valve that controls the turbo but not solved any help will be welcome.

 

Are you 100% the correct valve was changed and the right valve used. They are a pain to access on this engine and there are two different types of valve.

If all ok check the vacuum system for leaks and then boost pipework. Then that the turbo actuator linkage is moving freely.

That code is for lack of boost often caused by poor turbo regulation. Boost leaks often have a second code regarding airflow


Sent from my SM-T830 using Tapatalk

 

Are you 100% the correct valve was changed and the right valve used. They are a pain to access on this engine and there are two different types of valve.

If all ok check the vacuum system for leaks and then boost pipework. Then that the turbo actuator linkage is moving freely.

That code is for lack of boost often caused by poor turbo regulation. Boost leaks often have a second code regarding airflow


Sent from my SM-T830 using Tapatalk

Hi, am not the one that changed it, the mechanic did the work its a friend; i also have other faults with it P2562 P1497 and P2566.

 

hi everyone, problem seem to be getting solved, they changed the 1618JT 1618QL depression tubing and it seems that its working well, no fault code even with full throttle. thanks everybody for the help. any update will post it.