BMW E-series key fob hidden function. Engine running without key fob in. E90, E91, E92, E87, E60 ETC 

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This hidden function allows you to keep running your engine without key fob in.
It allows you to take out your key fob out and lock your car with engine running for special pourpouses (keep warm your cabin interior in winter or keep it cool in summer with air conditioner on).
This function isn’t mentioned in manuals.
E90, E91, E92, E84, E87, E60, E61, E63, E64, E65,