Why the check engine light comes on All modern vehicles have at least one computer to run the engine and transmission. Those computers take in data from sensors like the intake air temperature sensor, oxygen sensor(s), engine coolant temperature sensor, manifold absolute pressure sensor, and the mass airflow sensor. Something is wrong with the data or the circuit and that’s why the check engine light comes on Based on all the data coming in, the computer determines the following: 1. Is the circuit to the sensor in proper condition (are … Read More

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