2001 BMW X 5 replace battery now it wont start

I suspect a defective alternator...If you have a voltmeter, set it to read 12 volts...Read across battery terminals with engine off...Jump start vehicle and read across terminals again...Must read at least 2,8 volts higher..If not alternator is defective...If good there is a current drain on the battery when engine is off...Check for any lights remaining on...If you have a under-hood-light this is probably the fault...Remove bulb


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If your battery is dead enough, even the dead battery indicator won't light. Take the battery to an autoparts store for a bench test/charge first before trying anything else.

check the battery cables, positive and negative for corrision or a loose terminal

firstly try with the spare key, sometimes they become uncoded. Then if you have a voltmeter check the battery to make sure there is still a good level of power in it before getting the started motor cheked.

If the key is in off position it won't drain battery.
You may have battery draw in that vehicle , or the battery itself is going out.(BMW batteries are good for 4-5 years)
Both cases needs to be checked by workshop , cause BMW very sensetive to the voltage drop. When you disconnect battery you may need to perform some settings adaptation after you replace it or connect it back.
New BMW requared to reset computer even after brake job and battery replacement.

my 530i are 203 and problem was iwash the car with watter and starting problem no start all light is vuzible

Make sure the battery is fully charged first. Now you need to find out if spark to the spark-plugs is present and that the fuel pump is working. Let me know and we'll go from there.

THE BATTERY IS LOCATED IN THE RIGHT SIDE OF THE TRUNK IN A COMPARTMENT .... COULD BE THE BATTERY IS DEAD AND NEEDS TO BE REPLACED.... JUMP STARTING YOUR CAR CAN LEAD IN SERIOUS ELECTRICAL PROBLEMS .... YOUR BEST BET IS TO GO TO YOUR LOCAL BMW DEALER AND PURCHASE A NEW BATTERY

DME relay is faulty, its seperate from the ecu and was most likely fried when the ecu went........did anyone try to run an on board diagnostic code pull?

What was the jump method? NEG to chassis? That should tell you that the ground cables should be suspect - NEG battery to chassis and to engine.