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Hello,
I am having the same issue. Same code 21a023. Same engine stall once I approach a red light and idle for a few seconds. Auto start stop disabled.
My 2015 335i started randomly stalling at idle after driving for at least 15-20 minutes. For instance, I drive for 15-20 minutes or more, and then stop at a red light, and after 10-15 seconds of idling, the car lightly stalls and kicks into Neutral gear position. Auto start/stop is off. And computer threw a few codes but did not set CEL (see pic). (Lightly stalls meaning no rough jerk with stall).
Also interesting, is that after it lightly stalls, it starts right back up no hesitation. No limp mode. No half engine light. No other symptoms. Full power is available. It stalled with BM3 OTS stage 1 ACN map. And it also stalls with stock map. Engine oil full. Gas above 1/2 tank, Chevron 91octane. No coolant leaks. No oil leaks. No overheating. No unusual noises.
Checking sensor data, alternator output is 25+ amps. Battery voltage is 14.5-14.7v while running. Battery state of charge is 98%. Again, no misfire nor driveability issues. This just started happening, and since it is my daily, I’d like to fix it as soon as possible. I was initially going to wait for a CEL to turn on if the problem got more consistent or worse.
128k fantastic miles. Stock intake. Catless DP.
Checked engine air filter and it’s dry and clean.
Checked around engine bay and no chewed wires or anything.
I was thinking it could be a EKPM3 or fuel pressure sensor since those both could possibly be faulty without setting a CEL. Just a guess.
Any thoughts?
Thanks in advance.
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