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The MAP sensor for a 2001 Mazda Protege is found on a bracket just behind the upper passenger-side strut mount. This sensor instantly relays manifold pressure data to the engine's control unit, helping calculate air density and the engine's air mass flow rate. This information is crucial in determining the correct fuel delivery for optimal combustion. MAP sensors can malfunction due to clogs, contamination, or damage; excessive engine heat can also damage the sensor's electronics or vacuum lines. When a MAP sensor fails, the engine control unit may struggle to accurately gauge engine load, resulting in an imbalanced air-fuel mixture that can be either too rich (excessive fuel) or too lean (insufficient fuel).
In the 2001 Mazda Protege, you can find the map sensor situated within the intake manifold.