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 If you see the engine light on or the service engine soon warning light, the fault code P12A5 could be the culprit. This code is often caused by a faulty Manifold Absolute Pressure (MAP) Sensor, an open or shorted MAP Sensor harness, or a poor electrical connection in the MAP Sensor circuit. 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. What are the symptoms of a bad manifold absolute pressure sensor? The main symptoms of a bad manifold absolute pressure sensor include poor engine performance, roughly running engine, changes in fuel consumption, and increased gas emissions. 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. qMVuPZH.

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