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Known as the E39 , the 4th generation of the BMW 5 Series mid size sedan.

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car key isn't working properly

car key isn't working properly when pressed

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hey please can u help me my key seems to have lost its signal to start

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my key broke in 2 i had to fix it so we used glue to put it back together again but still not getting signal to start

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Give your Dealer your VIN number and have them make you a factory fresh key.

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Most of the car keys gives problem when their battery gets weak. You can easily replace the battery for most of the cars by watching corresponding videos:

etc.

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*Adding for historical correction purposes*

The E39/E46 use a soldered rechargable battery that gets recharged when the car is running. You can't replace it in these - it wasn't until the E9X when BMW went to a disposable cell.

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Not all E39 use a rechargeable battery!

My '97 540i has a non-rechargeable Lithium coin cell CR2016 (upgraded to CR2025, which fit fine).

When did BMW change the design? Do not know.

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Just initialize the key! It has a rechargeable battery inside that charges through induction (electromagnetic radiation conducted wirelessly by a coil inside the ignition to a very small coil inside the key, just like a cordless charging toothbrush). Whenever it is in the ignition, it is charging! Go for a quick drive and your key comes back to life.

Unfortunately, your problem (and mine occasionally) is that once the key gets dead, even after it has been re-charged, and even though the charged key throws the signal correctly once again, THE KEY AND THE CAR DECIDE NOT TO TALK! (If you don't believe me, go to an autoparts store, they have keyfob checkers that light up if it 'hears' the fob throw an IR signal.)

Luckily, we can simply 're-pair' the car to the key, this short process to fix your problem is called 'initialization':

Up to 4 keys can be initialized, but one after the next. 'button 1' in the locking button on the center of the fob. 'button 2' in the unlock button (NOT the trunk button closest to the keyring hole).

1. get in and close all doors and have all keys available (which can just be 1 key)

2.Using first key (or only key), turn ignition to KLR (so dash lights up, but don't start the engine), then switch off within 5 seconds and remove key

3. within 30 seconds of turning ignition off, press and hold button 2

4. all while holding button 2 down, tap button 1 three times within 10 seconds

5. release both buttons

6 if done correctly, all doors auto-lock and un-lock to indicate a successful initialization, good job.

if you have other keys, repeat steps 3-5 withing 30 seconds.

Cheers

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The key is not even turning in the first place so how do i insert and turn to KLr

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Perhaps this guide will help: 1997-2003 BMW 5 Series Key Battery Replacement

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My 9/96 build date ('97 MY) E39 has a lithium coin cell, which can be changed.

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