When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have a 2013 C300 Sport 4Matic, and have been fighting EVAP codes for months. Fortunately the car still runs great, it's just the annoyance of having the CEL illuminated. Current codes are P0455 and P0456 for EVAP system large and small leaks, and P0496 for EVAP system high purge flow. Throughout troubleshooting it now has a new OEM gas cap, new purge valve, new vent valve on the charcoal canister, and I've smoke tested it with no leaks found. Based on research it appears the only thing left to troubleshoot/replace is the fuel tank pressure sensor, which appears to be a major PITA because it's on the top of the gas tank and there's no access panel. Is there anything I'm missing, and is there an effective way to diagnose this sensor? I have a Launch X431 MB specific code reader, so I have some activation capability.
I dont have much experience with evap systems. I had replaced my purge valve when the car would not start after getting gas unless I pushed the gas pedal to the floor and was getting code P2422.
I see that now That is crazy to me, having to drop the gas tank just to replace a sensor. Here I was thinking being able to access the fuel pumps from under the seat was a great feature.
The sensor under the rear seat access panel on the left side is for fuel pressure, it actually has fuel running through it. The sensor used for EVAP is measuring the air pressure in the tank, it’s not in direct contact with fuel. Correct no inside fuel smell and no smoke during the smoke test, so I don’t think there are leaks there.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
