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The EVAP system on a BMW is slightly different from most other American or Asian cars. It employs something called the DMTL to diagnose leaks on the system. In this video I talk about what that module is and how it works so that you can better understand how to diagnose EVAP leaks.
The codes you might get for EVAP leaks are:
P0442 Evaporative Emission Control System Leak Detected (small leak)
P0455 Evaporative Emission Control System Leak Detected (gross leak)
Both can be diagnosed using this method.
If you're looking to get a good smoke machine, I can recommend this one (which I use in this video):
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However the price has gone up since I first reviewed it. AUTOOL makes a cheaper version, but it doesn't have flow or pressure gauges:
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There is an even cheaper tool that is made in the USA, however it doesn't look much different than the DIY version I made years ago:
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DIY Smoke Tester:
• DIY Smoke Machine For ...
00:00:00 Intro
00:00:23 How EVAP systems work
00:04:39 How BMWs are different
00:07:25 How to test any EVAP system
00:10:09 Where to hookup your smoke machine
00:11:31 Turn on the smoke machine and find the leak
00:12:27 How to close the "vent valve" to seal the tank and find the real leak
00:14:13 Where my leak actually is
00:14:49 Replacing the defective part
00:25:59 Verifying the repair
00:26:57 Wrap-up
This video is for entertainment purposes only. 50sKid assumes no liability for any repairs or modifications performed by the viewer as a result of the information contained in this video.