Sensors: Electrical device that measures the different performance parameters of the car.
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They are used to measure the air pressure, the temperature, the speed, the liquid level, the characteristics of the exhaust smoke, etc. They are connected to the ECU (Electronic Control Unit) and they provide the information needed to improve the engine's performance.
What's does this mean I mean I changed put a new TCM computer in I put a new shift solenoid in with the sensors it's still not passing first gear help please