My 525i se remote locking has stopped working , i had an auto locksmith check the keys (this guy is really good) he said the keys are fine so no choice took it to main dealer for diagnostics £60 later no faults showing on the car still charged but did hoover and wash it for me !!!? any way they said i need new keys the car is fine anyway needed id etc to order new keys and was in work the following day so never ordered , after work i put led bulbs in the number plate lights and lo and behold key remote started working great i thought everything works remote boot, locks , windows everything worked for a day then..... just stopped again
and i cant figure out what i done to get them going its driving me mad any help or suggestions appreciated i dont know whether to go back to the dealer and tell them the keys are fine and look for a refund for a misdiagnosis?

 

Please search 'diversity amplifier'. Very likely, that's failing.

Do you have second key? If so, the remote functions on that key work ok?

 

thanks both keys are the same , wont work the remote locking all other functions work from the keys the radio reception is fine in fact outstanding , also when it went to the main dealer they specified that the diversity amplifier was tested and was working correctly ?

 

If the diversity antenna is tested to be functioning ok, then the battery in both keys must be on last leg.
In that case, you have two choices - either open the keys and replace the battery or buy a new key.

 

changed battery in key annnnnnd waste of time no joy still not working any other ideas guys??
do the keys just stop working , can't understand it key started working for a few hours now nothing ?
car wont enter key programming mode either ?

hellllp!!!!!