QUY T I HOW OLD IS YOUR BATTERY? IF YOUR BATT. HAS 11.30 VOLTAGE OR BELOW THEN ITS NO GOOD. A GOOD BATT. HAS TO HAVE AT LEAST 12.30 OR MORE VOLTS TO HOLD A CHARGE .USE A VOLT METER TO THE BATT.IF YOURE PLANNING TO KEEP YOUR X5 FOR A WHILE AND DO YOUR OWN REPAIR AND DIAGNOSTIC I SUGGEST YOU PURCHASE A PEAK RESEARCH FAULT CODES TESTER. ITS AGOOD INVESTMENT, BASICALLY PAYS FOR ITSELF.THANKS.