There are three separate reasons for coding. One is to eliminate warnings of burnt out bulbs because the system doesn't detect the LED as being a bulb. The next is to prevent the lamps from blinking every few minutes. You won't know it's happening because you can't see the lights when you're driving. Everyone else will. The last is to change the voltage supplied to the bulbs from a pulsed DC to a constant DC by coding them 'is LED'. If you don't it will cause hyper flashing with some LEDs.
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I haven't had time to find where I put my wifi OBD unit
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It's above and to the left of your left knee. If it was a snake it would have bit you every time you got into the car.