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Wife and I just purchased a 2019 C300 Base model from her father. Apparently they've taken the car to dealership for every maintenance and have never experienced any issues, car currently has ~79,000 miles. The car is completely stock, no modifications performed on it whatsoever. Within a few months of now officially owning it though, unfortunately we got our first check engine light. Error code comes up as P04F0 (Wide Open Throttle Regeneration of the Activated Charcoal Canister Has a Malfunction). The OBD tool I'm using recommends that the fix is the Evaporative Emissions (EVAP) Vapor Pressure Sensor.
I haven't been able to find that part anywhere after a pretty extensive search. Even if I did, haven't been able to find any information or videos on where the part even is on the engine to replace it.
Has anyone encountered this issue before? If so, what should I try to change in order to resolve the issue? Thanks for any help with the situation!
Last edited by juanalzate0110; Yesterday at 03:53 PM.
Hi Tim, this engine is 2.0 L, inline-4 engine. I believe it's the M264 engine, google tells me specifically the M264.920 variant. Hopefully that helps, thanks in advance.
Has any work been done to the car lately, anything?
Helpful to know if someone was recently in the engine bay maybe replacing air filters or whatever. Could be as simple as something not put back the right way.
Can see in the diagram above how it is supposed to function.
Can see some type of pressure sensor along the way. I would like to know what this pressure sensor is reading. Can you find anything on your obd scan tool to see what that sensor (17) is reading?
Unfortunately the parts diagrams I use do not have anything with the M264 engine. I'll have to dig a little more.
It has all the Mercedes manuals as well as numerous other makes. Takes some time to learn to navigate the sections to find what you want. Somewhat limited info on later models like 2023 +.
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.
P04F0 Error Code
