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Yes I had similar code for cylinder 3 but it turned out to be glow plug module.I was experiencing rough idle for first few seconds during low ambient temp.
Bmw says that there is no proper way of checking glow plugs by measuring resistance but i would still check and compare the resistances of all 6 glow plugs.Atleast it would tell you if cylinder 5 glow plug is totally dead or not.
How is your thermostat?Does engine temp stays above 80~85 deg C?
Regarding your A48D code, rheingold says A48D is for rear seat entertainment reset(no fault).Image attached...
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