Quote:
Originally Posted by 2001 X5
So went to start our X5 Friday morning only to find it won't crank. Dropped key on sidewalk on way to car. Ordered a new key/fob and valet key. Car starts fine with new keys..now comes the oddity. Old key will start vehicle if you use new key first then the old one AND not remove old key from ignition. Starts every time with the old key till you remove it. SO....what's up here, apparently chip in old key is still good.....??????????????  |
The car does not re check the transponder 30 seconds after it has been shut off. If it stalls in the street you don't what the security system saying there is a problem and not letting it restart. So if you are starting it with your new key and then switching to the other it is not validating the transponder. You could do this with a key not programmed at all. But dropping your key shouldn't hurt the transponder. Perhaps you dislodged something inside that is COVERING the transponder. Break it open and have a look if it truly isn't working.
I make my own keys so I have a bit of an idea of what is going on :-)