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AFM (Active Fuel Management) is a diesel engine technology that allows cylinders to be disabled for fuel efficiency. If AFM lifters fail, they can be replaced with standard lifters for approximately $50 using an OBD2 port plugin, rather than the $3,000+ cost of full engine repair. This modification should be done before the lifters fail to avoid more expensive repairs. The system can be verified by checking if the engine runs in four-cylinder mode during coasting or red light situations.