P0455 code problem solved (I think) - Mercedes-Benz Forum
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#1 (permalink) Old 11-07-2007, 12:49 AM
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P0455 code problem solved (I think)

I've had the flashing gas gauge and check engine light with P0455 code for several months now. Both indicate a gross leak in the evaporative emissions control system. I finally got around to investigating the problem since I was already digging in my engine compartment to change the intake hoses and clean the throttle bodies. I think I found and fixed the problem. I was hoping it was something simple like a disconnected or damaged hose, and I did find a disconnected hose as I traced the hoses from the throttle bodies backward.

Here are some pictures:

This is the right side showing the throttle body, the evaporative emissions control system hoses which connect to the charcoal canister located in the trunk, and the purge valve.


Here is the left side picture of the same thing.


The valves open up periodically under control by the car's computer. This opens up the charcoal canister to the intake which draws the gasoline vapors off the charcoal in the canister and into the intake to be burned. This process renews the charcoal so that it can continue to trap evaporating gasoline vapors. The whole idea is to reduce hydrocarbon pollution by preventing gas vapors from escaping to the atmosphere.

And here in the center of the wiring harness tray is where the two hoses from the purge valves meet up with the main hose going back to the charcoal canister. This pic is exactly how I found the hoses, disconnected.


I simply reconnected the hose with the T-connector. I'm thinking it may disconnect on its own again in which case I'll put a clamp or zip tie on it to hold it in place. I did note a bit of tension as I was reconnecting. It's possible that heat has caused a bit of shrinkage in the plastic tubing. Well, hopefully this will do it. I'll have to drive a bit to see if the P0455 code stays away. Although my car is an S600, all models will have the same parts that I have shown (just arranged differently), and disconnected or damaged hoses will be a possible cause of this fault in any car.

Brett
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#2 (permalink) Old 11-07-2007, 04:08 AM
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Good spotting! This should go in knowledge base.
Regards,

S600Simon
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#3 (permalink) Old 11-07-2007, 05:11 AM
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Very nice Brett.

I will have to check this out as my problem came about right after I replaced my T-Valve. Would love my problem to be that I knocked that connection loose.

Thanks for posting.
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#4 (permalink) Old 11-07-2007, 07:05 AM
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thanks for ur interest to document ur work with photos .
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#5 (permalink) Old 11-08-2007, 10:56 AM
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Well, I think it's fixed. After a couple of days of driving, the diagnostic check section of the OBDII diagnostics has changed from "incomplete" to "complete" for the evaporative emissions system, and no faults have come up.

Brett
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#6 (permalink) Old 11-10-2007, 10:24 PM
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After ruminating on the cause of the hose disconnection for a bit, I realized that I may have caused the hoses to separate when I last changed the spark plugs.

V12 Uber Alles, Changing the Spark Plugs in a W140 Mercedes Benz

In order to more easily reach the cylinder #12 spark plug, I advocated flipping up the wiring harness tray that the evaporative emissions system tubing runs in. This action may have caused the hoses to pull apart. I cannot be certain of the timing of the spark plug change and the appearance of the P0455 fault code since it was so long ago, but they may have coincided.

If you follow my DIY article, you should check these hoses when the job is done.

cheers,
Brett
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#7 (permalink) Old 12-02-2007, 02:07 PM
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I just wanted to write to thank Brett San Diego for his input regarding the p0455 error code. I had the exact same problem for about 6 mos now. My tech had no idea and wanted to "troubleshoot" without any research. I have been searching the forums for months and taking careful notes of my own until I discovered a satsifactory plan of action. Your diagnosis was right on and after taking the steps to reattach the hose I have had no flashing fuel light ot CEL for this entire week. Thanks for saving me time and money.
Demeterial
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#8 (permalink) Old 12-02-2007, 09:59 PM
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Originally Posted by demeterial View Post
I just wanted to write to thank Brett San Diego for his input regarding the p0455 error code. I had the exact same problem for about 6 mos now. My tech had no idea and wanted to "troubleshoot" without any research. I have been searching the forums for months and taking careful notes of my own until I discovered a satsifactory plan of action. Your diagnosis was right on and after taking the steps to reattach the hose I have had no flashing fuel light ot CEL for this entire week. Thanks for saving me time and money.
Demeterial
Always happy to help. If you're still around, what model W140? 600? And, did you have the exact same disconnection or a disconnection at a different hose junction?

Brett
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#9 (permalink) Old 08-27-2008, 09:23 AM
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Now this is what a 'community' forum is all about. Brett - absolutely stellar job in diganoses, documentation, and sharing this info! I look forward to solving my P0455 code using this as a template (1997 E320 - W210)
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#10 (permalink) Old 08-27-2008, 02:17 PM
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Originally Posted by capmookie View Post
Now this is what a 'community' forum is all about. Brett - absolutely stellar job in diganoses, documentation, and sharing this info! I look forward to solving my P0455 code using this as a template (1997 E320 - W210)
Thanks for the kind words, and good luck tracking down your problem.

Brett
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