EVAP Purge Valve - P0441 - Mercedes-Benz Forum

Go Back   Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R129 SL Class
New User? Register - Forgot Password

BenzWorld.org is the premier Mercedes-Benz Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 03-24-2009, 09:11 PM   #1 (permalink)
BenzWorld Member
Catterman's Avatar
Date registered: Mar 2009
Vehicle: 1997 SL500
Location: Minnesota
Posts: 361
EVAP Purge Valve - P0441

GOt my first check engine code tonight, so I hooked up the scanner and got a code P0441 - EVAP Cntrl System Purge Flow fault. I didn't notice any driveabality issues when it happened, freeze data showed I was going 4mph.

Anyway, after a little searching I see it relates to fuel caps, some hoses, or Purge Valve. But don't see any R129's that had this issue? Any suggestions as to what I should do?

Not sure if it matters, but two tanks ago I had SeaFoam in it, and then now I have Amsoil PI.
1997 SL500 Pano & ADS
2002 Chevy Suburban LT
1998 Honda Odyssey
1977 Ford F-150 Custom, 4x4, 351m, auto
1971 Pontiac Bonnivelle 455ci small block V8, 55k miles

"The last man that was perfect was crucified"
Catterman is offline   Reply With Quote
Sponsored Links
Old 03-24-2009, 10:32 PM   #2 (permalink)
BenzWorld Moderator
NEOKEN's Avatar
Date registered: Dec 2007
Vehicle: 95 SL500, K&N, NEOKEN Ported TB, Custom Intake, RENNtech Sport Exhaust, AMG I Monoblocks
Location: Raleigh, NC
Posts: 10,778
Lifetime Premium Member
This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

EVAP emission canister purge is contolled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.


Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light.


A code P0441 could mean one or more of the following has happened:

-Bad vacuum switch
-Broken or damaged EVAP line or canister
-Open in PCM purge command circuit
-Open or short in Voltage feed circuit to Purge Solenoid
-Faulty purge solenoid
-Restriction in EVAP solenoid, line or canister
-Corrosion or resistance in purge connector

Possible Solutions:

With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:

-Check for damaged EVAP lines/hoses or canister
-Check for open or short in voltage feed circuit to Purge Solenoid
-Repair restriction in Evap line or canister or soleniod
-Repair resistance in purge connector

Last edited by NEOKEN; 03-24-2009 at 10:54 PM. Reason: typo error
NEOKEN is online now   Reply With Quote
Old 03-25-2009, 08:58 AM   #3 (permalink)
BenzWorld Elite
RKH's Avatar
Date registered: Apr 2008
Vehicle: 1998 SL500 Panoramic Roof
Posts: 8,404
Hopefully it is just a loose gas cap.
RKH is offline   Reply With Quote
Old 03-25-2009, 02:09 PM   #4 (permalink)
BenzWorld Member
Date registered: Jan 2006
Vehicle: SL500 (R129), 500 SEC (W126)
Location: UK
Posts: 298
I had a broken EVAP line recently. There was a faint put-put-put noise from the front left of the engine bay, sounded like a bearing was going bad on one of the auxilliary pumps. It cost buttons for a replacement part.
'99 SL 500
'93 E300 D T
'86 500 SEC
jjrodger is offline   Reply With Quote
Old 03-27-2009, 10:40 AM   #5 (permalink)
BenzWorld Member
Catterman's Avatar
Date registered: Mar 2009
Vehicle: 1997 SL500
Location: Minnesota
Posts: 361
Thanks for the replys! After I cleared the code I haven't had a chance to look at anything, or even drive it to see if the "check engine" light comes back on. I live by Fargo, ND and the flooding is crazy and on top of that we had a blizzard with 10+ inches of snow and temps this morning were 1 above F.
Catterman is offline   Reply With Quote
Old 04-05-2009, 07:50 AM   #6 (permalink)
BenzWorld Member
robinp's Avatar
Date registered: Feb 2004
Vehicle: 300SL-24V/CLK 200 /Toyota Harrier
Location: Singapore
Posts: 333
bro, i always have petrol smell in the cabin when my car idle got into traffic jams...
do u have any idea? i notice that when the smell comes on , i turn off the (*) air con compressor switch and the smell goes off. also the car doesn't have this problem when cruising...I somehow felt its related to the vacumn but don't know where to start the troubleshoot.
Please help....
robinp is offline   Reply With Quote
Old 06-09-2012, 06:48 PM   #7 (permalink)
BenzWorld Junior Member
sl500nyc's Avatar
Date registered: Oct 2011
Vehicle: sl500 1998 , w210 E240 1998
Location: new york
Posts: 41
hi all , i would like to clean my purge valve any idea how i'm taking off the tubes that conected to it? they held wit a clamps , should i take them off? or just pull strong? they look like special clumps any ideas?

sl500nyc is offline   Reply With Quote
Old 06-11-2012, 07:14 AM   #8 (permalink)
BenzWorld Member
Catterman's Avatar
Date registered: Mar 2009
Vehicle: 1997 SL500
Location: Minnesota
Posts: 361
I think they just pulled right off. I don't really recall, but do remember it was easy to do. I can look again when I am by the car. Good luck!
Catterman is offline   Reply With Quote
Old 06-15-2012, 09:54 AM   #9 (permalink)
BenzWorld Junior Member
Date registered: Dec 2006
Posts: 8
Many thanks to NEOKEN

I was desperate for years to understand how this engine fuel supply does work.
So far I want to first thanks NEOKEN for the detailed description. This is a great help to better undersatnd what's going wrong with my car. As other I do have fuel vapors that come into the cabin... but only when the tank level is between a quarter full to the beginning of the reserve! When I open te fuel cap to refill the tank at that particular moment, I always have some pressure in it, but apparently not more or less than when the tank is at a different level. I do have less smell if I turn off the air conditionning. What would you recommend me to inspect first please. This is an early model from 07/1991. Kind regards from France. Fabrice
Axilane is offline   Reply With Quote
Old 06-15-2012, 03:00 PM   #10 (permalink)
BenzWorld Elite
aam's Avatar
Date registered: Dec 2004
Vehicle: SL500-500SEL-190E
Location: Los Angeles CA
Posts: 7,618
The magic word is that when the A/C is OFF no smell/ODOR.

The A/C fresh air INLET is located in front of the windshield.....

That means that the odor is coming from the ENGINE COMPARTMENT.

Look for gas hose, line engine leaks, EHA, (especially at the two 0 rings,)gas distributor,
any charcoal canister hose.
(Look also for disconnected hoses.)

I suspect a leaking gas pressure REGULATOR.
(You know the rubber hose on it.)

The PRESSURE gas line.
(Look for small cracks.)

aam is offline   Reply With Quote

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R129 SL Class


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Topic Author Forum Replies Last Post
Purge valve dlbehrns W208 CLK Class 2 10-04-2008 04:27 PM
Purge Valve guardgrey51 R170 SLK Class 1 08-04-2007 11:35 AM
Where is the purge valve? Raceit W203 C-Class 3 02-05-2005 09:48 AM
Purge Valve The Beast W211 E55 AMG, E63 AMG 1 02-05-2004 08:17 PM
What is a purge valve? Guest (MBNZ) W203 C-Class 2 11-06-2001 01:17 AM

All times are GMT -7. The time now is 01:01 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.1

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.