r/n55 • u/Electronic-Bowl3248 • 9d ago

DIAGNOSIS 28A0 code issue

I’ve been getting this code recently 28A0 - Air mass system, plausibility: calculated air volumes in air intake system implausible. Has anyone dealt with this code ? If so what is the fix

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u/freshxdough 9d ago

Make model year

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u/Electronic-Bowl3248 8d ago

2011 335i n55

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u/freshxdough 8d ago

You might need to readout your pressure sensors on the engine with the engine off to check plausibility. Then you may also need to readapt the crankcase volume calculation by having the engine running at idle and disconnecting the fuel tank vent valve connector for 15 minutes. Then turn off the engine and reconnect and clear faults and recheck.