Changing the oil is the most common maintenance you'll have to do on your car, but what happens when the check engine light comes on afterward?

The Engine Control Module (ECM) is the computer responsible for controlling the engine. The ECM communicates with other vehicle control units via a communication bus.

Learn all you need to know about Engine Control Modules (ECM), or Engine Control Units (ECU), in this article concering electronically controlled midget engines. Enginology is step one in the ...