The information is coming from me and I know this because I did a lot of chip-tuning for these BMW models. Now I do it a little bit different than other tuners, because I am a
software engineer old style. That means I can read, understand and write Assembler code.
I always disassemble an eprom to see what te program it is doing. Gives me more control over certain functions. Now I have found the factory diagnostic protocol, but there's no trace of any OBD2/EOBD protocol in 1996 thru 1999 petrol ecu's.
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