VANOS motor problem?

[bear55]

My car is 2012, 92000km, oil change every 5-6000 km

Got the below codes
133711 Intake valves 2 adaptation air mass flow: lower limit position reached
102902 Air mass 2, plausibility: air mass too low
for DME2 a few months back, no CEL, cleared it and they comes back randomly.

It happened when the car stops (at traffic light or idle for a short time). RPM will drop to 500 or below and it will go back to normal after a few seconds, or just stall sometimes. This is what happened when codes came out. After that idle will be a little rough, rpm will be a little higher when stopping, and the exhaust sound deeper.

Replaced both pre-cat O2, replace MAF, clean and swap solenoids, replaced coils and plugs. Codes still come back

Need some input, thanks in advance

[M5Rick]

Originally Posted by bear55

My car is 2012, 92000km, oil change every 5-6000 km

Got the below codes
133711 Intake valves 2 adaptation air mass flow: lower limit position reached
102902 Air mass 2, plausibility: air mass too low
for DME2 a few months back, no CEL, cleared it and they comes back randomly.

It happened when the car stops (at traffic light or idle for a short time). RPM will drop to 500 or below and it will go back to normal after a few seconds, or just stall sometimes. This is what happened when codes came out. After that idle will be a little rough, rpm will be a little higher when stopping, and the exhaust sound deeper.

Replaced both pre-cat O2, replace MAF, clean and swap solenoids, replaced coils and plugs. Codes still come back

Need some input, thanks in advance

Could be the cold start flaps engaging.

[WH1TE_M5]

Did you figure this out ?

[isjm91]

I have this exact same problem now. did you manage to find out what was the issue?

[M5Rick]

Remove and check both air filters, often forgotten and if black against the sun then replace them.

[isjm91]

Originally Posted by M5Rick

Remove and check both air filters, often forgotten and if black against the sun then replace them.

Thanks for the advice. Do you mean the air intake filters?


My fault codes says 133711: valve tronic 2 eccentric shaft adaptation, lower stop reached

[M5Rick]

Originally Posted by isjm91

Thanks for the advice. Do you mean the air intake filters?


My fault codes says 133711: valve tronic 2 eccentric shaft adaptation, lower stop reached

Yes, if intake filters are dirty/partially blocked then revs would drop in some instances, it's worth clearing this first before going deeper.

[Kyriakos84]

I have the same Codes. The CEL light pops up sometimes After 800km of driving . No issues with boost . Just the anoying CEL. Air filters are also new Original ones. Did anybody figuered out this issue???

[Kyriakos84]

Forgot to mention that the cel pops up not when boosting but when cruising with about 1500rpm

[isjm91]

Changed new filters. Did not solve the problem

[M5Rick]

Ok it's a 2012 and US didn't get M5's until 2013, could it be a Canadian one (who got them in late 2011 onwards) and I'm just thinking bad gas now, where in California are you.

[isjm91]

Hi M5rick, appreciate that you’ve been following up. I’m from Singapore and my car is a 2012 MY. I have been using 98/100 Ron which should be equivalent to Oct 93/95. We get good fuel here so I don’t think it’s the fuel problem

[M5Rick]

Originally Posted by isjm91

Hi M5rick, appreciate that you’ve been following up. I’m from Singapore and my car is a 2012 MY. I have been using 98/100 Ron which should be equivalent to Oct 93/95. We get good fuel here so I don’t think it’s the fuel problem

Glad the fuel is ok there, but with what bear55 was saying about revs dropping it has all the hallmarks of possible bad gas.

[Kyriakos84]

Hi guys ! Did somebody manage to find out what the issue is/was ?

[anoller]

Holy craptards, I’m hitting this issue also. “Cold start not controllable”, “air mass plausability: air mass too low,” and more. I’ve replaced plugs, coils, MAF sensors, VANOS solenoids (all 4), exhaust side VANOS camshaft sensors. And she still runs like (bleep). Need help, don’t want to pull the covers and replace timing chains and cam sprockets just to continue to have issues.

[isjm91]

Originally Posted by anoller

Holy craptards, I’m hitting this issue also. “Cold start not controllable”, “air mass plausability: air mass too low,” and more. I’ve replaced plugs, coils, MAF sensors, VANOS solenoids (all 4), exhaust side VANOS camshaft sensors. And she still runs like (bleep). Need help, don’t want to pull the covers and replace timing chains and cam sprockets just to continue to have issues.

Hi sir. Just an update, I rebuilt my engine as the oil consumption got pretty bad. My workshop replaced the timing chains too for vanos, but did not replace the vanos sprockets. I no longer fault codes but I still have a mild version of this where I gently throttle, the rpm goes down before going up, and drops back down to about 500rpm before going back to idle rpm at around 700. This happens in neutral, d1 and reverse. So just letting you know, might be the timing chain. But I did not get this issue fully resolved. Power also feels down for some reason. I’m on stock map, no mods.

[Solo_M_Tech]

Have the valvetronic system tested. Had an F06 M6 with these faults, TSARA indicated swapping DME’s and reprogramming the car to fix the issue. 100% resolved.

[bear55]

I still got this code sometimes. The following link ask to check if the intake valve is choking. My indy said that is possible, because the volume of air coming into the engine during idle is controlled by that shaft, and choking makes the shaft turn to the maximum(lowest) position, and in my case this happened mostly when the car is idle or stopping. Indy recommend walnut blasting but is $$$ for this engine!

https://bmwfault.codes/XMLDiagView?d...kwMDk2MDMwNQ==