Most states require number plates be illuminated to aid police during traffic stops. Replacing the number plate bulb in the Audi A4 is a quick job that can be done with few tools. Auto parts retailers typically sell replacement bulbs. Identify which one is correct for your vehicle by paging through the catalogues in the lighting aisle -- or asking a clerk for assistance -- and then choosing the correct model from the display rack.
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Things you need
Remove the number plate by unscrewing the bolts holding it in place. Unlock and lift the boot lid.
Remove the screws on each side of the light cover. Remove the light cover.
Pull out the old bulb. Insert the new bulb into the housing. Replace the light cover and the screws that hold it in place.
Close the boot lid and reinstall the number plate.
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