Programming Instructions for 2021 Mazda CX-3 Smart Key Remote Fob

Important Notice: The 2021 Mazda 3 does not support on-board programming for smart key remote fobs. Programming must be performed by a qualified automotive technician using factory-level diagnostic tools.

Programming Procedure:

• Step 1: Ensure the smart key fob you wish to program is compatible with the 2021 Mazda 3 and is not already programmed to another vehicle.
• Step 2: Gather all existing remote fobs. Some Mazda systems require that all remotes be reprogrammed together during the session.
• Step 3: Schedule an appointment with a certified automotive technician or service center equipped to perform smart key programming.
• Step 4: If the vehicle is drivable, consider bringing it directly to the service location. This may reduce overall service charges compared to mobile assistance.
• Step 5: Be ready to provide proof of vehicle ownership, such as a government-issued ID and vehicle registration or title.
• Step 6: The technician will connect professional diagnostic equipment to the vehicle’s onboard system to begin the programming process.
• Step 7: Using manufacturer-specific software, the technician will register the new smart key and reprogram any existing remotes if required.
• Step 8: Once programming is complete, the technician will verify full functionality—including lock/unlock, proximity access, and push-button start features.
• Step 9: Confirm how many remotes are now paired with the vehicle’s system to ensure only authorized keys are active.
• Step 10: Store extra remotes in a secure location, and periodically test each fob to ensure proper operation.