Potential buyer for my car wants to know if it's emission certified for California. How do i go about about proving that it is?

all Mercs (within the past couple of decades to my knowledge) are CA legal

https://mbworld.org/forums/c-class-w...bout-smog.html

tell him to call MBUSA because these cars are 50 state legal. There are no differences in the cars sold to one state from another state.