01 740iL - Evaporative Emission System Code - Bimmerfest - BMW Forums

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7 Series - E38 (1995 - 2001)

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Old 02-27-2012, 11:19 AM
cgstelle cgstelle is offline
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Location: Chicago
Join Date: Sep 2011
Posts: 28
Mein Auto: 2001 740il
01 740iL - Evaporative Emission System Code

Had noticed recently a whistling sound that was noticeable as car came to a stop and was idling. Thought at first may be a belt or tensioner. However, seems sound can only be heard from inside cabin. One week earlier the "check engine soon" light had come on then went out a few days later. Car has been running great as always. Came back on today. Code: P0440 Evaporative Emission System. Was the intermittent whistle sound only heard from cabin related to this DTC? Sounds like something coming from back of engine close to vents. Any thoughts greatly appreciated.....Chris

BTW: 2001 740il
49,000 Miles

Last edited by cgstelle; 02-27-2012 at 11:25 AM.
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Old 07-22-2012, 08:06 PM
dalibors dalibors is offline
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Location: Washington DC
Join Date: Jul 2012
Posts: 1
Mein Auto: BMW 740i 2001
I had same problem with my old 740il '96

That sound you have is coming below car somewhere between engine and transmission.
You need to change OSV (oil separator valve) is located at the back of air intake manifold...
Part is around $100 and here is a link how you can change that part...
I was do that and is work 100%...
Here is a link how to do that by yourself
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