|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Error code P0440 ?
|
|
09-23-2012, 03:14 PM | #1 | |
Team iTouge
121
Rep 2,101
Posts |
Error code P0440 ?
Just the other day I had an error code that sent a CEL on active, I scanned the code with an OBD2 reset/scan tool and it said code P0440. When I looked it up in the manual, it said malfunction with the evaporate emissions system. My question is what could that be? Is it major or could it have been a gas cap malfunction? I was able to reset the code and erase it and it never reappeared. (Its been about 1 week) I just wanted to make sure that nothing was wrong with it. Any help will be greatly appreciated!
__________________
Quote:
|
|
09-23-2012, 04:39 PM | #2 |
Private First Class
6
Rep 112
Posts |
There's an electric pump that pressure tests the system for leaks whenever the car "wakes up". You may hear it cycle quickly when you open the door first thing in the morning.
I believe I posted a pic of this pump at one point. It's located inside the passenger side rear wheel well under the plastic shield. Its called a DTML Pump. Worth about $100 and takes about an hour start to finish. Easy job. http://www.e90post.com/forums/showthread.php?t=260065 If its not a loose gas cap this would be my bet. |
Appreciate
0
|
09-23-2012, 06:39 PM | #3 | ||
Team iTouge
121
Rep 2,101
Posts |
Quote:
__________________
Quote:
|
||
Appreciate
0
|
09-24-2012, 04:00 AM | #5 |
No 55mph
1621
Rep 8,476
Posts |
Sometimes that code is thrown for the simple fact that the gas cap has not been put back on correctly as you surmised.
Take off cap, put back on and give it a couple 'clicks' see if the problem goes away. It could also be that the cap is bad & needs replaced. I always start with the least expensive/involved items on the diagnostic tree before moving on to the more $$ Last edited by 1QuikWS6; 09-24-2012 at 04:10 AM.. |
Appreciate
0
|
09-24-2012, 06:45 PM | #6 | |||
Team iTouge
121
Rep 2,101
Posts |
Quote:
Quote:
__________________
Quote:
|
|||
Appreciate
0
|
10-03-2012, 11:58 PM | #7 |
Banned
83
Rep 466
Posts |
I had the same problem and ppl kept saying its the gas cap but when I replaced it the light when back on after 10min of driving. Then after researching more I found out it was the vapor sensor which is common to going out on bmw's. I did a DIY on this forum on how to replace it. Cost can be about 200+ at the dealer to diagnose. I'm pretty sure that's what's throwing the code.
|
Appreciate
0
|
Bookmarks |
|
|