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The Stoichiometric Air Fuel Ratio in Dodge Ram 2500 vehicles is generated by the MAP Sensor which measures the positive air pressure that infiltrates the manifold to the intake to inform the ECU in fuel adjustments. The MAP Sensor in fuel injected engines is used to calculate the air density and therefore the air-fuel mixture density in the combustion chamber, thus, forming part of the speed-density formula. Although the naturally aspirated engine can incorporate either the MAP or MAF sensor, a forced induction engine, on the other hand, employs the use of both. The MAP Sensor also helps the vehicle's diagnostics and plays a crucial role in EGR valve test as it provides specific data required for fuel delivering and monitoring and engine's activity.