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all BMW 3series come with a factory fitted imobiliser, it can be bypassed under the dash near steering wheel, (usually purple wires) but i advise you seek an auto electrician to do it for you as any mistake can blow the ECU (brain for the car) rendering it useless without replacing the ECU and they are not cheap (but also generally not too expensive either)
When contacting the AUTO ELECTRICIAN, tell them that the imobiliser has gave up the goat (most auto electricians should be familliar with the bmw's imobiliser problem, as its a common fault) tell them that you want it bypassing, or removed completely (they will charge for this service) it also maybe an idea to have your log book handy and some form of I.D as most electricians will not disable an imobiliser without proof of ownership or proof of person (i dont need to state why, as this is obvious)
if this doesnt solve your problem, there is a fault with the chip inside the key, or it maybe that the ECU isnt reading the chip!
sometimes bad battery or imobiliser has switched on.disconnect battery.make sure you have radio code!!!!leave disconnected for 30mins.reconnect battery lead.try new battery in keycard.could be that.otherwise not sure.sounds like poss imobiliser fault to me.good luck