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While on the subject, a bulb error gets thrown when the warm and/or cold check pulse doesn't give the expected current flow that you get with low resistance incandescent bulbs. The purpose of a resistor is to provide that low resistance, eliminating the error. One problem with that is that a major advantage to LED is the 80% or so reduction in current draw compared to incandescent, reducing the load on the alternator, the battery, and even the wiring and connectors. When you use a resistor it eats up all of that otherwise saved current, so that part of the LED advantage squandered, and the resistor won't stop the blinking anyway. Coding out the warm/cold checks eliminates the blinking and errors, so there's no need for resistors.
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