Battery is only 1 year
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2003 BMW 325i Question: Yellow Battery light is on what can b wrong?
If the charging system is ok, I've had a vehicle previously with the same issue, and it ended up being the battery in the key. Worth a try.
Answer #2Greg's Orange Auto (13642 Answers) , Orange, CA - (714) 361-9386globalhelper September 19, 2012, 12:53Master
good chance your alt is going out have it tested