The Engine light on a 2002 Chrysler 300M illuminates when there is a problem with the vehicle's emissions control system. The emissions control system is composed of a variety of components, many of which are sensors. When one of these sensors malfunctions or fails, it will cause the 300M's on-board diagnostic (OBD) computer to generate and store a trouble code. When this happens, you'll née to have an auto parts store run a free diagnostic check on your 300M (you can do it yourself with a OBD scan tool) and you'll need to fix the problem. After that, you need to reset the Engine light to turn it off when the repair is complete.
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Pull down on the fuse panel cover that is located under the steering column in the 300M's driver-side foot well.
Turn the ignition key to the "on" position. This is the second position on the ignition. Do not crank the engine.
Locate the fuse for the ECU (electronic control unit) using the fuse diagram located on the underside of the fuse panel cover. Pull the ECU out of the fuse panel using the fuse pullers in the fuse panel.
Wait five minutes and replace the fuse. The Engine light will go out when you start the vehicle.
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