It could be caused by something as simple as a loose gas cap or a faulty oxygen sensor or spark plug or something as severe as a faulty catalytic converter. ![]() The check engine light is a signal that the onboard diagnostics system (or OBD II) has detected a malfunction in the vehicle’s emissions, ignition, fuel, or exhaust systems. If you understand what it's supposed to do, you also can anticipate what kinds of things unexpectedly cause it to come on and what you can do about it. The light comes on and the driver freaks out, thinking the vehicle is about to blow up. ![]() The check engine light is a commonly misunderstood piece of equipment on a car.
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