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If it will crank and start when boosted, then I would have the battery tested. Even though it is fairly new, they can be defectively manufactured and end up getting bad internal plates. If the battery tests good, then the starter motor may be drawing too much current.
i have a 2002 BMW 325I
I tryed to change the remote control battery.. now the car does not start... HOw can I turn off the anti theft system... or what can I do to start the car
When inside your car is it a the IBS (intelligent batery sensor) what this is the all recharging controlls. Battery must a registrated to car memory when new is where after change to empty battery! In diagnostical tools only! Car remember so how a old empty battery and recharging no good!
WARNING: Use you AGM specially batterie with fibre glass for your BMW attached only!
It sounds to me like neither the battery nor the alternator is the problem. The first thing to check is the wire connections at the starter, a starter solenoid if one is used and the battery. Dead alternators never charge the battery and a car with a dead alternator will not ever start without a jump or a charge. A dying starter, if it turns over at all will draw so much current that it will kill the battery in a couple of starts. A final note - many auto parts stores can check the condition of the entire battery - charging - starting system without taking anything off the car and they will do it for free. I would check for loose wires first.
It is most likely a flat or dead battery but first check the battery terminals are clean and firmly attached.
If all above checks ok replace the battery.
There are several reasons why an attempted jump start may not have worked, such as :-
1) the jump cables used are poor quality,
or
2) the battery used as a power source may not have sufficient capacity.
if it does not do anything and the lights dont turn on then its either loose battery cables or dead battery but if the lights turn on and you here a clicking noise then your starter went bad and 3/4 the time its usually the starter
IF THE BATTERY WENT DEAD RECENTLY YOU COULD HAVE LOST THE ROLLING CODE BETWEEN THE DME AND THE EWS MODULES. HAVE A DEALER CHECK TO SEE IF THEY ARE STILL ALIGNED. ALSO TRY A DIFFERENT KEY JUST IN CASE ONE IS BAD.
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