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Old 02-03-2013, 09:36 PM
Jsmk23 Jsmk23 is offline
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Location: Palm Springs, CA
 
Join Date: Aug 2011
Posts: 30
Mein Auto: 02 BMW 325i
Quote:
Originally Posted by 01e46sprt View Post
I have The same issue on my 01 325. It's your secondary air pump. It runs only when the car is cold to warm the cats. Only runs for about 5 mins than goes away. What's happening is it's become dirty after so long and that's what causes the noise. It's not a big deal if you can deal with the whistle for 5 mins every morning. Atleast that's what my mechanic told lol.
Did you ever change it? And would you know if it's hard to do?
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