A turn signal bulb replacement is needed when theturn signal light bulb goes out. All manufacturers have specifications on what type of turn signal bulb to use. It is important to use the type of turn signal bulb your vehicle's manufacturer recommends, because if the incorrect style or type of bulb is used it may cause damage to the wiring or lamp housing.
In performing a turn signal bulb replacement you may need to remove the lamp assembly or even some trim panels to gain access to the defective turn signal bulb.
While many manufacturer factory warranties and extended auto warranties do not cover the cost of a turn signal bulb replacement, there are maintenance plans available that will cover the cost of a turn signal bulb inspection.