dexter_morgan

I recently purchased 2012 E550 with only 30k miles. I got 2 engine code came out just today.

p228097 the air mass flow in the intake air system (cylinder bank 1) has a malfunction. system function is restricted
p222B84 Pressure sensor 2 has a malfunction. There is a signal below the permissible limit value

What do they mean and is it something that I can fix? I did not feel any power loss etc. I really do not want to take it to a mechanic as they really ask an arm and leg in Canada
I appreciate any help.

Left Coast Geek

clear the codes, see if they come back.

check the wiring and connectors on those sensors if they do,

S. Madman

Check your camshaft sensors for oil, search for my post. See if you have oil on the ECU.

dexter_morgan

I cleared codes and they came back. Wires look okay.

dexter_morgan

I had removed two camshaft sensors to see if they have new version (having green seal) and installed back. I got the codes 2 days after I did this. Cables, connectors look okay.

Siegmann

It may be the pressure sensor on the rear of the passenger side airbox.

dexter_morgan

I will check do you have schematic or part number?

Siegmann

P/N is A0071530528 for either side:

dexter_morgan

Thank you so much.

Siegmann

No problem. It's an easy DIY if that is indeed the problem. The reason I think that may be it: those sensors' outputs are compared to the post-turbo MAP sensors to give the computer a pressure ratio for calculating mass flow. When a sensor goes bad, the 2 sides read differently and you get a code.

One of your error codes refers to bank 1 (passenger side) and the other to sensor 2. I'm not sure if sensor 2 would be on bank 2, but it may be worth replacing both anyway.

dexter_morgan

Isin't that early for sensors to get fail as car has only 30k miles.

dexter_morgan

Is there any way to know if these sensors really went bad, Is it possible to measure them?