jmirgy

Hello all.
My turn to post a question please.
This is re my 2013 S550.

My Carly has come up with this fault code. P026A00 Fault code - The efficiency of the charge air cooler is not sufficient.
I cleared it and after driving my S550, it has re-appeared, so I think it is a genuine fault.
It is listed as critical and I fear it may be beyond my repair skills, but I am not sure which component to focus on ??

Idle speed is listed as a cause, but the idle is quiet and steady.
I will check the coolant levels this morning, but don’t know much about the No 1 Turbo pressure Sensor and how to check it.

The below clip is from the internet, where I went looking for more details on the fault code.

Is there a fix I can do gents, or should I just bite the bullet and head to a dealership ?

Regards,
Mirgy

BOTUS

first thing check the coolant level, there's a second bottle / reservoir for the charge cooler hidden under the engine cover I believe

jmirgy

Thank you Botus, I didn’t know about the second reservoir…. I will let you know how I go….

jmirgy

Good call BOTUS !!

It was a warning about low coolant level in the secondary reservoir.

But the dealership also conducted a pressure test, while they had the car there and
Confirmed that there were no leaks..

So all in all, I am happy with the outcome. Also got a $60 discount for being a “loyal”
customer, even though this is only my second visit to them. But very happy that the
car was given a good going over and came out very healthy and the dealership has
not tried to make any money from me.

Thanks for your help and suggestions…