blackstarr777

I have a E420 and recently my gas light started flashing and then my engine electronics ligh came on. I called the dealer and explained the problems and they stated to change the gas cap. I followed those directions and it went away. Long and behold it came right back so I went to my MB specialists and did a scan and i received an error code P0455 something to do with the emissions. He reset the code and it came back after a couple of weeks so can someone tell me if they had this problem before and what did you do to fix it.

ohlord

Okay, the code refers to the evap control system,so first check that the gas cap you replaced is oem,you really need a good one from the dealer or online,not some cheap one that fits all from a autozone,if it is oem check that the gasket is in place and not damaged.Then look down into the gas fill tube gently push your finger around the edge and see if it moves out and a air gap is seen.Next you need to check all the hoses associated with the emissions system.for holes ,leaks,wear,damage.
You have an air leak in the system someplace,most likely at the cap,and since it cleared the code for several weeks the first time,it still is the most likely suspect.Had a fuel filter replaced lately?look for loose fittings.
Other then that,you should clear the code after you do the above,you should not notice any driveabilty issues,the system is to keep fuel vapors out of the little air we have left.It should be fixed,a.you wont pass a smog test b.you wont like the cel on all the time.
Dont know where you live but most smog stations can test the gas cap for free on the leak down tester.
If the above does not work,and I think one of them will,you will need to have a smoke test done to locate the leak.
ohlord
"GOT CODES?"
You can buy your own obd2 scanner for 39 bucks at harbor freight tools in n.j. go online to find one near you,or order it online,worth there weight in gold,also autozone or pep boys and the like will read codes for free and save you an expensive trip to the dealer.

okc329

Take off the rubber sealing gasket on the inside of the gas cap and turn it over. Mine seemed to have a groove from the rim of the filler tube in it. Then
take off the rubber hose which runs from the fuel tank/charcoal recovery cannister to the input of the regeneration(purge) valve and put a good squirt of WD40 into the input side of the valve. Re attach the hose. You may have to do this again if the CEL comes back on. These steps fixed my P0455 problems.

SpaceCity E 430

I had this code recently and I'll describe what I went through to get it fixed.

I don't know how similar your E420 evap system is to the one on my E430, but the first thing I would check is the regeneration valve for function. It applies engine manifold vacuum to the evap system. On my car it is in the engine compartment on the drivers side, and there is a vacuum hose running to it from the back of the intake manifold, and another that goes to the firewall and ends up at the gas tank. When you pull the vacuum line off that leads to the firewall there should be a pulsing/popping sound as the valve opens and shuts, metering vacuum to the gas tank. If that is good then you either have a leak somewhere, or the charcoal canister shut off valve is bad.

The charcoal canister shut off valve is normally open but closes for the system test that pulls a vacuum on the system to check for leaks. If that valve doesn't seal off you'll get a p0455 code.

What's funny to me is that a faulty regeneration valve is supposed to throw a different code. I changed my shut off valve first but no joy. Did the regeneration valve next, and that fixed it. No vacuum in the evap system during the test for whatever reason will evidently throw a p0455 code. Cherck the source of vacuum first, the regeneration valve. No vacuum to the system makes the computer think there is a leak.

Also, don't fill the gas tank with the engine running. That will throw that code as well I'm told.

blackstarr777

Where can i find the rubber hose from the fuel tank that leads to the regenertion valve.

ohlord

http://w210.pietrzyk.net/enginesm112_47fuelsys.htm
hope it helps
ohlord
"GOT CODES?"

SpaceCity E 430

In the pic that ohlord provided it is Y58/1. They call it the purge valve. A lot of people call it that, but at the dealer it's called a regeneration valve. Check it out first.

ohlord

Tried to get you to follow the lines and see how the system works,did you?The purge valve on most E series is located on the driverside wheel well,around the area of the abs block just in front of the brake vacuum booster.It has two black lines coming and going back to the rear of the intake manifold and to the tank.I'm going from memory but it is about 2inches tall and has a black cap that says MOT or something like that.Check those lines are not worn, damaged, off, or torn.If they look fine ,start the car and put the end of a screw driver on the purge valve(the one with the MOT)and put your ear on the end of the handle,this will make it easy to hear the beating sound (several times a second) of the valve.If it is stuck,there is your code.Operating,you need to check for other leaks in the system.
If it is stuck,you can free it up by pulling off the vac line or both lines and with the aid of a small funnel or a squeeze bulb( for babies ears) filled with seafoam or marvel mystery oil,squirt some into the tubes and the valve,let sit for 15 minutes and hook up the lines and start the engine,after about 15 min repeat the test to hear if the valve is now pulsating.Clear the codes,and see what happens.
ohlord
"GOT CODES?"
It is a little more work to use the seafoam instead of wd40 but I have found it really removes the crud in the lines and valve much more completely and the left over you can add to your next fill up of gas and clean the fuel injectors.

ohlord

one more thing when you test the purge valve,the enging needs to be at normal operating temp,in order for the engines systems to tell the purge valve to start operating, a cold engine will leave you thinking i don't hear anything so it must not be working,so run her for 15 min to get to 185f or so.Then run the test.Keep us posted.
ohlord

SpaceCity E 430

He can just pull the vacuum line off that goes to the gas tank and if the valve is working it will make a loud popping sound.

ohlord

Way to check the valve,better than my old school way.I just thought he would locate the valve at the same time and clean it.
ohlord
"GOT CODES?"

SpaceCity E 430

The non-functioning regeneration valve I pulled off my car didn't look gummed up, but I didn't inspect it all that close either.

They get stopped up? With what? There should only be gasoline vapors passing through there.

ohlord

Fix on cars with purge valves,the lines and valve get gummed up from the fuel vapors,gas fumes are chock full of tars,oils,additives.That's why you do not want to inhale them,so yes they will seize up the purge.Doing the clean trick can save you the r/r,if it works,the one you had to remove might have been totally dead.
ohlord

Big J

Wow, thanks alot as this topic solve my error code. i did get a different code which is 0400 but the code is gone thanks

Big J

I guess i spoke to early engine light comes on again and it must be something else. code 0400

ohlord

tell you the cel would come back.You need to check vac lines,and clean the egr tube into the intake.I just posted a diy tip on benzworld.org w210 section on how to clean the tube,where it is,how to remove it.
I use an old speedometer cable in a drill,however I saw on t.v. last week on the speed channel that some company has a product called snake bit that does the job.Google it -snake bit egr cleaning-
I have the cables,but it looked like it does the job also.
That will clear up your p0400 code,it is rare for the egr to fail and common with that code to be the carbon blockage.
get r done

http://www.benzworld.org/forums/w210...questions.html
read down the post for the instructions

Big J

Thanks for the replay, i read the post but what confuse me is the egr valve as mention is in the back to the engine, i do have a 99 e430 and it seem that it has two egr valve in the front of the engine. is this diff from the one from the back as mention or is for the old inline engine thanks again.

ohlord

egr valves they are part of the secondary air system(going from memory)
the egr is located back on the pass side below the intake tubing it had a aluminum tube snaking back into the middle upper part of the intake.
cleaning the tube and the carbon out usually solves the p0400 problem
http://www.benzworld.org/forums/w210...questions.html
ohlord

Big J

Thanks, run my fingers around the hose and there is a this small check valve in the front, the rubber seem not in good shape but will work on it on the weekend so i do not to rush everything thanks again.

ohlord

a good idea to check the condition of all vacuum lines as a leak in them will also throw a code

GregMb320

Ive been fighting this problem in my car .... I had it post "P0455 code" , i dont hear or feel my purge valve is working eaither on warm or cold engine !! I replaced the purge valve and same thing , i mean still throwing a code after 10-15 minutes of drivingQUOTE=ohlord;2400341]one more thing when you test the purge valve,the enging needs to be at normal operating temp,in order for the engines systems to tell the purge valve to start operating, a cold engine will leave you thinking i don't hear anything so it must not be working,so run her for 15 min to get to 185f or so.Then run the test.Keep us posted.
ohlord[/QUOTE]