You can't reset SES light if your X5 engine needs some service. If you used ODB II scanner and that makes SES light goes away. However, the SES light re-appear very soon later. If SES light keeps on and off you really need to check it out.

On another hand, you won't need to reset SES light once your engine has been serviced.

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BMW X5 2004 - 2005 MB E320
BMW 1999 528i/ 1998 Nissan PathFinder (sold)