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The Mass Airflow Sensor (MAS) in your 2007 Dodge Ram 1500 can be found on the passenger side of the engine, near the air filter housing and throttle body. You can easily spot it as a small grey plastic connector with wires attached, secured by two screws and a wiring harness. If you observe a decrease in fuel efficiency, power, or torque, it may be due to a malfunctioning MAS. Replacement is simple; you can purchase a new one, part #21326, from Autozone for approximately $55.
The 2007 Dodge Ram does not come with a mass air flow sensor.
In a 2007 Dodge Ram 1500, you can find the mass airflow sensor in the air duct that sits between the air filter housing and the throttle body.
The 2007 Dodge Ram 1500 is equipped with a map sensor and a throttle body sensor but does not have a mass air flow sensor on its 4.7 engine.