If you just have a LED by it's lonesome (as it would come to solder to a circuit board for example) you would need a resistor. If you have an LED "bulb" usually the resistor is built in. This is in general, wherever you are using it. I don't know how it would relate to a CEL in particular but it's possible the ECM wants a certain resistance there I suppose.
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Last edited by OBeer-WAN-Kenobi; 01-02-2014 at 06:38 PM.
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