How to I get my second key to start my car?

20

Asked by Jul 20, 2014 at 01:27 PM about the 2001 BMW 5 Series 530i

Question type: General

I had two 2001 bmw 530i keys, one working and the second dead.  I was able to start
the car with the dead key right after I started the car with the good key.  So, using the
second key, I drove around for 45 minutes assuming the battery would recharge.  After
the drive, I tried using the remote on this second key and nothing happened and it
would not start the car on its own.
So, I reprogrammed both keys.  Now, the remote works with both keys.  However, I still
can not start the car with the bad key.  It will only start the car right after I have started
the car with the good key.  Is there anything I can do to make the second key fully
functioning?

4 Answers

68,885

No sound,s like low voltage from weak battery may have shorted the key,may have to replace it.

257,425

TST is right, Time for a new key. The battery has a rechargeable battery in it, while others have tried to replace it by cutting the key open, it isn't worth it in the end.

20

Thank you both for answering. I have a quick follow-up question. As I stated, it's not that this key won't start the car under any circumstance. Why is it able to start the car after I start the car with the good key, turn the ignition off, place in the bad key and the car starts immediately. That doesn't sound like a normal "short" and the remote does work fine now. Do you think using the bad key for a long trip (over 2 hours) could help? Is it possible the battery needs to be fully charged? I have a working key and a second key is not necessary but it would be nice to have a backup key.

2 of 2 people found this helpful.
68,885

Because computer key from last crank is what it think,s it is,but when you cut car off it loose,s it power to crank again.

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