Nic Cuadra

Hello, I was driving my car the other day and my check engine light came up, I scanned it with my reader and 2 codes came up, one of the was P04F0 which I'm pretty sure is the evap system is turned on every once in a while but I also had C343C which I've never seen before. I was wondering if anyone knew what that code meant or what the problem is? thank you ! I don' know if it would help to know that the car is tuned and is straight piped but yeah.

Skuzeeii

I just got P04F0 the other day on my 2015 C300 a couple weeks after an ECU tune. Did you ever find anything out on these codes?

Nic Cuadra

The only thing I could find is that there is high pressure or a leak in the EVAP system, I cleaned the dust off from around the gas pump hole and I don't know how much that helped but for me, it comes and goes periodically. As far as I know, the worst that can happen is some gas fumes leave your car and give you a little worse gas mileage.