Not working? Or not working from a distance. Several things can interfere with the remote causing it to have a greatly reduced range. In other areas it may work from a greater distance. If its just not working at all then works after you get ouf of the car perhaps the battery is not able to hold its charge anymore? The battery in the key is recharged while its in the ignition. I have never had that happen but I assume it is possible.

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2008 ///M5 - Black Sapphire Metallic/Black Perforated Merino/Madeiro Walnut trim/6-spd Manual
2005 X5 4.8is - LeMans Blue/Black Nappa/Anthracite trim | born 05/20/05 - For Sale
2003 ///M5 - LeMans Blue/Black Interior/Aluminum trim/6-spd Manual - retired
2002 525i - Jet Black/Black Sport/5-spd Manual - retired
2002 X5 3.0i - Sterling Gray Metallic/Tan Leather Sport/5-spd Manual - retired