The yellow light that looks like a picture of an engine is commonly called the "Check Engine" light. It is also called the "Malfunction Indicator Light" (MIL)
The engine and transmission control computers monitor several circuits and systems critical to the proper operation of your engine and trasmission. When there is a problem one of these circuits or systems, the Engine Control Module (ECM) or Powertrain Control Module (PCM) turns the light on to let you know that there is a problem. It will also store a "Fault Code" in memory. To find out what the problem is, a service technician must first scan the ECM or PCM to retrieve the fault codes in order to diagnose and repair the problem.
A little information about fault codes: Contrary to popular belief, fault codes do not tell a mechanic what parts to replace. (There are many so-called mechanics that can't seem to grasp this) Fault codes only indicate which circuit or monitored system has a problem. The mechanic that works on your car must check out the problem circuit or system to see what is actually causing the problem.
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