Symptoms: Engine not start; Acceleration is not good; Idle speed is unstable; Intermittent extinguishing Also Known as: Manifold Absolute Pressure Sensor, Engine Load Sensor, Pressure Sensor, Boost Sensor Be Accurate. Be Determined. 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 A malfunctioning or faulty intake manifold pressure sensor can lead to various engine problems such as rough idle, poor fuel economy, lack of power, and even engine stalling. Therefore, it is important to maintain and replace the intake manifold pressure sensor as per the manufacturer's recommendations. The MAP sensor, or the manifold absolute pressure sensor, is an essential component of the engine management system in the Honda Accord. Also, a MAP sensor is found in fuel-injected vehicles, and its primary function is to provide information about intake manifold pressure to the Powertrain Control Module (PCM/ECM). 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 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. 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. What Are The Signs Of a Failing MAP Sensor? As the MAP sensor fails, it can cause various issues with the fuel system and vehicle performance. An inaccurate reading from the sensor will cause r2WgJ.