How do you change plugs on C-240?
Pretty easy on this car....First you need to remove the entire air filter box that sits on top of the engine,just pull it straight up off its clips. Second you need to remove the ignition coils that are screwed into the valve covers with torx head screws. Its easiest to remove the coil assemblies with the spark plug wires, so pry the wires off the plugs, and leave the other end attached to the coils. A 18mm open end wrench works pretty good to help pry the wires off the plugs. Once coils and wires are removed, the spark plugs are accessed on the sides of the engine, and can be removed. Install in reverse order. Good luck.