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I'm a newbie...I've owned my 2005 C230 Kompressor for 13 months and have had ZERO problems till now. The check engine light came on today while I was driving. It's causing a P0456 code.
I suppose it seems to be getting slightly less MPG, but nothing overly noticeable. Nothing sounds different. All the hoses I can see (even took the main engine cover off) appear to be fine. The gas cap also looks fine and seems to be sealing as tightly as it ever did. Overall, the car is running just as good as it ever has...
Could it have been caused by me leaving my motor running while I get gas? I know it may sound dumb, but I never realized that leaving the car running while getting gas could cause problems. (okay some people blow themselves up in winter from static electricity...I figure I can take my chances!)
I'm a newbie...I've owned my 2005 C230 Kompressor for 13 months and have had ZERO problems till now. The check engine light came on today while I was driving. It's causing a P0456 code.
I suppose it seems to be getting slightly less MPG, but nothing overly noticeable. Nothing sounds different. All the hoses I can see (even took the main engine cover off) appear to be fine. The gas cap also looks fine and seems to be sealing as tightly as it ever did. Overall, the car is running just as good as it ever has...
Could it have been caused by me leaving my motor running while I get gas? I know it may sound dumb, but I never realized that leaving the car running while getting gas could cause problems. (okay some people blow themselves up in winter from static electricity...I figure I can take my chances!)
Any suggestions would be GREATLY appreciated.
don't take this the wrong way but...NEVER EVER FILL UP YOUR TANK WITH THE CAR RUNNING. It's for your and your car's own good.
Not taking anything the wrong way...question is...can I fix this without spending $$$$ unnecessarily? I need to take a 5 hour road trip Friday afternoon (family emergency). Like I said, my car doesn't have any weird sounds and seems to be running like it was the day I bought it (13 months ago). If I drive it am I risking major damage???
So...Lesson learned. I will NEVER EVER EVER EVER EEEEVVVVVVER leave her running while I'm fueling up! Promise!!
SWEET!!! Thank you SO much!! To run the diagnostic testing I was quoted $125/hr - $189. The Service Adviser at the Benz dealership did say the Purge Valve is known for going bad. He also said that the CEL would go off in 3 days or so if it was something simple like fueling while car was running. I'd think it's safe to say it's the purge valve or the other thing.
I listened to my car today...still not hearing anything unusual. Should I be?
SWEET!!! Thank you SO much!! To run the diagnostic testing I was quoted $125/hr - $189. The Service Adviser at the Benz dealership did say the Purge Valve is known for going bad. He also said that the CEL would go off in 3 days or so if it was something simple like fueling while car was running. I'd think it's safe to say it's the purge valve or the other thing.
I listened to my car today...still not hearing anything unusual. Should I be?
Is it something I can repair myself?
Thanks again! I really appreciate cha!!
You can change the purge valve yourself. Hang on a sec let me get you more info and directions. The purge valve seems something similar to this so swapping it out should be a breeze.
THANK YOU!!! I would really like to make sure I am good to go before I take off on a 5 hour road trip tomorrow.
^..^
you should be fine for your road trip, but definitely replace it yourself 'cause it will save you a lot of money! this forum is a great resource to learn how to do a lot of this stuff yourself, welcome aboard!
You can change the purge valve yourself. Hang on a sec let me get you more info and directions. The purge valve seems something similar to this so swapping it out should be a breeze.
Hello, I came across to this thread coz I am having the same problem.... can you share info on how to replace purge valve? thanks much
2005 230 Kompressor Coupe, 1977 Suzuki PE 250, 1977 Suzuki RM250, 1987 Toyota Supra
How do you know the purge valve needs replacing? Are you getting the P0456 code on your OBDII tool? I was getting that code and replaced the purge valve and that was not the problem on my 2005 C230 Kompressor. I had a different problem and a very less costly solution than what the dealer suggested less costly. Let me know thanks Doug and I'll try to help.
Doug
How do you know the purge valve needs replacing? Are you getting the P0456 code on your OBDII tool? I was getting that code and replaced the purge valve and that was not the problem on my 2005 C230 Kompressor. I had a different problem and a very less costly solution than what the dealer suggested less costly. Let me know thanks Doug and I'll try to help.
Doug
Yeah, Im getting an on and off CEL and was getting P0456 code. Thanks.
2005 230 Kompressor Coupe, 1977 Suzuki PE 250, 1977 Suzuki RM250, 1987 Toyota Supra
I assume you are resetting the CEL. Without correcting the problem it will keep popping.
Anyway, I was getting that code. This is what I did.
1. I took the soft rubber seal off the inside of the gas cap in case the leak was thru the cap. Cost nothing but didn't solve the problem and I kept getting the P0456 code. I went to my independent mechanic who ran a smoke test to find the leak but he was unable to find it and suggested I go to the MB Dealer. Leaks can be difficult to find.
2. Took the car to the MB Dealer and was told I needed a new purge valve at a cost of about $450.00 installed. They did the work and 2 days later the same code popped.
Went back to the dealer who offered to replace the old purge valve but wanted me to pay the labor. I asked them what could cause this code to keep popping and they said there is a plastic tube running from the gas filler neck to a charcoal filter. Why they didn't look there the first time, I don't know, but they do like to sell new parts. They took the right rear fender liner off and discovered the plastic line was severed. They said it's possible snow built up (I'm in Canada) and a large bump could cause the wheel to smack the line and break it. They quoted me $671.00 to replace the part. I asked them to put the car back together and left. Of course I was out the $450 but I do have a new purge valve lol.
3. I went to my independent mechanic and we found the leak. He put a stent on the broken line and charged me $90.00. That was over 2 years ago and problem solved.
So that's what happened to me. I would try the simple fixes before investing in a bunch of expensive parts. Needless to say, if you can find an independent mechanic that you trust...that's the best way to go. The Dealers expect that cost is never a problem. This forum has a lot of great info, and lots of folks happy to help.
Good luck with this.
I assume you are resetting the CEL. Without correcting the problem it will keep popping.
Anyway, I was getting that code. This is what I did.
1. I took the soft rubber seal off the inside of the gas cap in case the leak was thru the cap. Cost nothing but didn't solve the problem and I kept getting the P0456 code. I went to my independent mechanic who ran a smoke test to find the leak but he was unable to find it and suggested I go to the MB Dealer. Leaks can be difficult to find.
2. Took the car to the MB Dealer and was told I needed a new purge valve at a cost of about $450.00 installed. They did the work and 2 days later the same code popped.
Went back to the dealer who offered to replace the old purge valve but wanted me to pay the labor. I asked them what could cause this code to keep popping and they said there is a plastic tube running from the gas filler neck to a charcoal filter. Why they didn't look there the first time, I don't know, but they do like to sell new parts. They took the right rear fender liner off and discovered the plastic line was severed. They said it's possible snow built up (I'm in Canada) and a large bump could cause the wheel to smack the line and break it. They quoted me $671.00 to replace the part. I asked them to put the car back together and left. Of course I was out the $450 but I do have a new purge valve lol.
3. I went to my independent mechanic and we found the leak. He put a stent on the broken line and charged me $90.00. That was over 2 years ago and problem solved.
So that's what happened to me. I would try the simple fixes before investing in a bunch of expensive parts. Needless to say, if you can find an independent mechanic that you trust...that's the best way to go. The Dealers expect that cost is never a problem. This forum has a lot of great info, and lots of folks happy to help.
Good luck with this.
I appreciate your help! I'll go and do that. Ill go by my local mech that does my tune ups for me. *crossing my fingers* hopefully id have as simple issue as you.
Last edited by RheiRhei; 08-06-2013 at 11:39 PM.
Reason: typo
Old thread, but a quick question. The pic of the fuel pressure sensor on top of the gas tank, has the floorboard been removed to gain access? If so, is there a tutorial? I'm getting the P0456. Trying to find the easiest access to that sensor if I need to change it out.
It's a small plate with about 6 screws if I'm not mistaken. Pop that off and you will have access inside the tank. It is sitting under the rear driver side seats. Very easy to get to.
After posting, I hit YouTube and found a couple of videos. Doesn't look hard at all. Gonna change out the purge valve first and see if that clears the code. Thanks for responding.
Another potential source for this code is the fuel filler assembly. Mercedes eventually upgraded the part, but I don’t know whether it was prior to the build date of your car. My 2005 had the older part, but your 2006 may have the upgraded one. I managed to find the upgraded part used and fixed my problem for about $140. I have attached a document showing the process. You can check out this thread for more information: https://mbworld.org/forums/c-class-w...er-neck-2.html
Good luck.
Last edited by KevinH2000; 05-15-2018 at 07:40 AM.
Purge valve has been replaced. Reset CEL. So far, so good. It's my wife's car and it hardly gets driven. It's a 2006 C230 and only has 71,565 miles. It is shocking how things still break down with mileage that low.
When I got the P0456 it was the fuel filler neck that was leaking. Pricey part. If your P0456 comes on when your fuel tank is at half or less, then it's most likely the filler neck. Alternatively, clear the code and keep your fuel tank above half full and the code will not pop up...the test that triggers p0456 only occurs when the tank is at or below half full.
There is a YouTube video I found where a 2005 MB owner removed his filler neck assembly, smoke tested it, and found a hairline crack in a plastic barb located near the actual fuel filler opening. As another user above had his mechanic perform, he was able to repair it by creating a “stent” type repair. I don’t know if it was the same spot.
Because I don’t own a smoke tester and really didn’t wanna take out and possibly replace the entire assembly, I started thinking of other ways to attempt a repair under the assumption my leak causing the same code was in the same location as the YouTuber’s. What I discovered was that you can access the spot by simply pressing down the rubber shroud/gasket where the fuel opening is. You can see the spot where the hose connects to the barb. I purchased a product called Permatex spray seal and sprayed several coats on there. So far, the P0456 code has not returned. Something for others to think about and possibly try.
Here is a link to the YouTube video. Many props to this guy!
04-27-2011, 08:44 PM
OEM code P0456 - 2005 C230
this forum is a great resource to learn how to do a lot of this stuff yourself, welcome aboard!
