[Bmwfan55]

Hi all, I've had this problem in my 2011 n55 for about 3/4 years already. Once in a while, I wanna say 3 times a year, I start the car and when driving, it feels engine is not making enough power. If I step on the gas, that would trigger a drivetrain malfunction message, followed by the car misfiring and running pretty rough. I switch off the engine, switch back on and car drives normal. At chasing this issue, I've replaced:

All coils
All injectors
Vacuum hoses
HPFP
Plugs
Valve cover and gasket
Vanos solenoids
Breather hose
Maf sensor
Camshaft position sensors.

After other engine and suspension parts, I wanna say I've spent around $12 k in the last 3 years trying to fix the issue. Car runs strong, but once in awhile this problem shows up. Codes are misfires on all cylinders plus p0171. Has anyone encounter this issue? I'm so done with trying to drive the car without being scared of the engine exploding one day. Thank you for your help.

[beegeezy]

IMO, the best way to figure this out is to log while this is occurring. Hopefully then you could narrow this down. Throwing parts at problems gets very expensive, as you know!

[Bmwfan55]

Originally Posted by beegeezy

IMO, the best way to figure this out is to log while this is occurring. Hopefully then you could narrow this down. Throwing parts at problems gets very expensive, as you know!

I have done that. Showed to mechanic and he even didn't have a clue what it could be triggering it. I guess I'll have to deal with the misfiring 3 times a year lol. Thanks for your input

[chipguy]

Are you aware of this SIB? Did you check the I-level of your car?

[TZ]

I would suggest to get the real BMW code with ISTA or other BMW compatible scanner.

[Bmwfan55]

Originally Posted by TZ

I would suggest to get the real BMW code with ISTA or other BMW compatible scanner.

All these codes are insta+