28A0 - Re group to fix tihis issue together! BMW X5 xdrive35i

[Nic0las456]

Hello Guys,
I got this BMW X5 2012 xdriv35i E70 last year and I am trying to keep it for long term.

I have been dealing with a code : 28A0 ( Air Mss System, plausibility: Calculated air masses in the air intake system not plausible) for long time.

This is was has been done to the car related or not to the issue:
Order:


RELATED:

DMLT VALVE replaced

Purge valve replaced

charge pipe replaced with FTP

Valve cover and other parts replaced. OEM

TMAP/MAP Sensor replaced (intake and charge pipe)

MAF sensor cleaned and new gasket installed

Superjet pump vacuum hose replaced

Air filter box gasket replaced.

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NOT RELATED:

Current Miles: 110.000

Oil filter and gaskets MANN, Oil 5w30 Liquid Moly , air filter MANN , drain plug and gasket - changed every 5k miles.

PREMIUM 93-94 octane fuel (Delta, Shell, Sunoco)

Brakes pads , rotors and sensor

Parking brake actuator

Spark Plugs and Coils

Oil filter housing gasket and mickey mouse replaced, coolant flush

Transfer case fluid changed

Differentials fluid changed.

Transmission fluid and filter changed.

Heater control valve

radiator cap

steering wheel cap

L/R Mirror glasses

Right interior temperature sensor HVAC

AUC Sensor

Exterior and Interior HVAC Filters

Parts supplier: FCP EURO (OE/OEM)

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I have been doing some smoke tests and this is what I found and Fixed.

Charge pipe leaking: FIXED

Maf sensor leaking: FIXED

Map Sensor leaking: FIXED

Superjet pump vacuum line leaking: FIXED

Air box filter gasket leaking: FIXED

Valve cover gasket leaking: FIXED

Map Sensor leaking: FIXED

besides that I can't find more vacuum leaks with my smoke teste, I don't see any smoke coming out anywhere.

What else can I do ?

Something also weird is that the EVAP Monitor never gets done.

Car runs perfect , no issues , no bad idle, not knocking (just some times you can feel a small misfire but the RPM does not go crazy.

The light and code triggers when the car is being drive at constantly low RPM (1000rpm-1500rpm) and around speed of 25-35mph.

If avoid those situation I won't get the light but I will get the code sometimes as pending.
I am tired of this code

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Some Live data:

Short trim fuel are usually at 0%
Long term fuel are usually at -2,3%
Short trim sensor 2 is usually at 99.2%

O2 b1s1 is usually at : 1.4 - 1.5
O2 b1s2 is usually at : 0.7


Intake manifold pressure after throttle valve: 13.93 psi
Intake pipe vacuum before throttle valve (charging pressure - setpoint value) : 14.65 psi
Intake pipe vacuum before throttle valve: 14.63 psi
Charge air temperature: 115.7 F

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Please let me know what else can I do to diagnostic and fix this code, It is the only code that the car has.

Thank you so much!

[Spaceme1117]

To me this sounds like you may also have a leak somewhere in the EVAP system coming from the fuel tank. The EVAP system can cause a vacuum leak as it is also plumbed into the intake.
Can you smoke test that?

Other possibility is this from a couple of threads on BimmerFest forum:

https://www.bimmerfest.com/threads/2...essure.977220/

The last post says this "Remove tank valve connector which is right beneath the airbox, let the car idle for 15min and plug tank valve connector back in. Clear the codes and it should remove the code permanently, works 95% of the time."

This post shows what connector that is: https://www.bimmerfest.com/threads/n...stion.1026257/

This thread suggests that this is a procedure to reset the adaptation for this system. Seems worth a try and may fix your code.