Symptoms of a bad or failing MAP sensor include: 1. Excessive fuel consumption A MAP sensor that measures high intake manifold pressure indicates high engine load to the 2. Lack of power A MAP sensor that measures low intake manifold pressure indicates low engine load to the PCM. The PCM 3. Symptoms Of A Bad MAP Sensor 1. Check Engine Light. The engine control unit constantly monitors all the sensors in your car engine while you drive 2. Lean Air-fuel Mixture. The MAP sensor's primary purpose is to measure the air pressure in the intake manifold to 3. Rich Air-fuel Mixture. The When you start the engine, pressure in the intake manifold decreases creating a vacuum that is applied to the MAP sensor. When you press on the gas accelerator pedal, the pressure in the intake manifold increases, resulting in less vacuum. The manifold absolute pressure sensor measures the pressure in the air intake manifold and sends this data to the engine control unit (ECU). The ECU uses this information to determine the air -fuel ratio for the combustion process , thereby influencing engine performance and efficiency. Here are the most common symptoms of a bad manifold absolute pressure sensor: Due to erroneous engine load calculation, a defective MAP sensor will impair the ECM's ability to regulate air/fuel ratio and ignition timing. This can result in an overly rich or underly rich air-fuel combination. A bad MAP sensor might cause the following symptoms: Symptoms of a faulty MAP sensor can include: Malfunction Indicator Light (MIL) illumination Lean or rich air-fuel mixture Failed emissions test Poor fuel economy 1. Malfunction Indicator Light (MIL) Illumination A faulty MAP sensor may not provide accurate manifold pressure data instantaneously, or may provide incomprehensible data to the ECM. sBsi.

intake manifold pressure sensor symptoms