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This Chevrolet Cobalt MAP Sensor is simply a sensor that measures the amount of pressure, namely positive air pressure, which is incoming to the intake manifold and relays this information to the ECU for fuel adjusting. In fuel injected engines the MAP sensor helps in the computation of the air density to identify the appropriate air/fuel mixture for combustion. While MAP and MAF sensor may be found in naturally aspirated engines, forced induction engines will tend to incorporate both. This is especially the case given the fact that the MAP sensor is crucial in the on-board diagnostics, and also that it translates data into air mass with the help of the intake air temperature sensor, thus being very useful in monitoring and sustaining the efficiency of the car's engine.