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Old 11-07-2023, 05:46 PM
X5chemist X5chemist is offline
Join Date: Jun 2021
Location: Austin, TX
Posts: 1,291
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The secondary air pump runs for a few seconds at cold start up. I'm not sure how or if it turns on with a hot engine. Have someone start it while you touch the pump. On mine, I don't think I heard it go over 45 seconds. When the pump starts to go bad, it will whine loud. You'll hear it sitting inside.
'06 X5 3.0i - bought @143,123 miles (12/26/20)
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