This video demonstrates how to test a the incoming voltage to an oven igniter. Igniters can burn out over time, but if the igniter is still testing positive, the problem could be an incoming power issue.
Other commonly replaced parts:
Oven igniter
Bake element
Broil element
Oven control board
Relay board
Safety valve
All of the information provided in this part testing video is applicable to the following brands:
Frigidaire, GE, Jenn Air, Kenmore, KitchenAid, Magic Chef, Maytag, Thermador, Whirlpool