How do you find an engine number on Mazda M4-121G?

The engine number for a Mazda M4-121G can typically be found on a metal tag attached to the engine block. It is usually located near the front of the engine, on the driver's side. The engine number is typically a combination of letters and numbers. It may be helpful to consult the owner's manual or a service manual for the specific location and format of the engine number for your vehicle.