EVAP Purge Valve - P0441 - Mercedes-Benz Forum
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#1 (permalink) Old 03-24-2009, 10:11 PM
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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
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#2 (permalink) Old 03-24-2009, 11:32 PM
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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.

Symptoms:

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

Causes:

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 11:54 PM. Reason: typo error
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#3 (permalink) Old 03-25-2009, 09:58 AM
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Hopefully it is just a loose gas cap.
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#4 (permalink) Old 03-25-2009, 03:09 PM
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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.

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#5 (permalink) Old 03-27-2009, 11:40 AM
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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.

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"
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#6 (permalink) Old 04-05-2009, 08:50 AM
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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....
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#7 (permalink) Old 06-09-2012, 07:48 PM
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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?


thanks
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#8 (permalink) Old 06-11-2012, 08:14 AM
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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!

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"
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#9 (permalink) Old 06-15-2012, 10:54 AM
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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
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#10 (permalink) Old 06-15-2012, 04:00 PM
aam
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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.)

Regards,
aam.
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