7/26/2023 0 Comments Bmw 550i bit serial data interface6) 2C9F Control heater sensor after cat (bank 2)Īny thoughts/guesses/pointers/suggestions would be appreciated. 5) 2C9E Control heater sensor after cat 4) 2C9D Output heater 02-sensor before catalyst (bank 2) Searching the web we have found descriptions of this protocol: So it seems that this bit-serial data interface is a single-wire data bus with a data transfer rate of 1. 3) 2C9C Output heater 02-sensor before catalyst 1) 2E7C bit serial data interface, signal (BSD wire failure) The first code won't clear, so I suspect there is an actual failure, but I can't imagine it would be causing this issue. During the hesitation, it almost sounds like it is bogged down and there is an audible change when it picks up (it sounds happier). 5 seconds, then it seems to clear itself and accelerate normally. If I go full throttle, regardless of the RPM or speed I'm at, I get a little hesitation for about. This is how I bought the car and it has been hesitating and throwing codes since day 1 (it came with a tune for a supercharger on it but no supercharger so I reflashed it with the ESS NA tune). Car has ESS tune on it, aftermarket secondary air pump, possibly the Motorsport thermostat, stock air box/filter but has a charge pipe.
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