A 2006 should have about one more year of life in its original battery, but if you have left the lights on a few times and run it flat, the original battery may be dying. Maintenance free batteries don't tolerate deep cycling very well.
It is common that an old battery will have enough voltage to run the lights and radio and so forth, but fail to put out enough amps to crank the engine.
If the car will start with jumper cable assistance, replace the battery.
Leave the jumper cables on while you replace the battery to keep the computers powered up so you don't have to reprogram anything afterward.
You will likely find that the original size battery in this car is a little unusual. Not all vendors sell it and if they do, the one they have may have been sitting on the shelf for some time. There are several battery sizes (group #s) that will fit in this spot. I choose a more popular size so I get a better deal and a fresh battery.
We have tried to jump start it an I just still get the same humming noise..I also took my battery off an put it on my 97 BMW and it started an everything worked..so I dont believe it's the battery..
Ouch. This is sounding serious. The only humming sound I can imagine that would occur only when you press the starter button would be the starter motor free-wheeling. In order for the starter motor to spin, the solenoid has to be closing its contact, but there could be a mechanical problem with the solenoid actuator arm, or the gear in the nose of the starter could be shattered. Either way, you are looking at a complete new starter/solenoid assembly.
If the problem were the anti-theft circuit, I do not believe that you would hear anything when you press the button.
There is a remote chance of a couple of teeth broken on the ring gear, but we don't even want to think about that.
A starter and solenoid will set you back about $300 if you buy it on line, $500 at the dealer. The cost of the starter, however, is not the painful part. You have to pull off the intake manifold to access the starter. The total job is about $1000 at the dealer.
Removing the intake manifold is a bit of a pain on these cars. Be very careful with the electronic throttle assembly. I don't know what happens to them, but I have read a couple of accounts of people messing them up and ending up towing their car to a shop after they remove and replace the intake manifold.
Well wen ur I'n the car u hear a humming noise but when you are under the hood you can hear clicks..
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Try going to a local Oriley Auto Parts or even an Autozone, I am having a similar issue with my 04 325i that I have jus replaced the battery, but now the car every once in awhile resets and the key will only unlock the driver door, and when you get in the car no lights are on and you put the key in the ignition and it is as if the steering wheel is in the safety lock mode where it keeps the key from turning unless you turn the wheel simultaneously. But even if you get the wheel turned the key still won't go past the accessories mode. I had the battery checked, and it is a couple months old, also I checked the alternator and it is fine. But the starter is pulling over 200 plus amps. This car has no after market parts no subs or anything. It should only pull 165-180 amps. I spoke to a mechanic buddy who owns a European car shop and he said that the starter mechanisms in the vehicle stop communicating with the battery and alternator mechanisms and it catches and won't compute with the electronics to start the vehicle. Quite the pain when you get dependant on a vehicle and when one thing goes you fix that and then three things go.
My next step is having my starter and battery and alternator bench checked. This way it can be put on a load and tested.
Best of luck, and keep updates as will I.
-car fanatic BMW ~*~
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