Not necessarily. Gas valves very rarely go bad. Here's the part listed as the correct one for your oven. Check to see if the one you installed is the same. Several things can prevent a flame. One of the most common, but least considered, causes is dirty ports in the burner. Look closely at it and if there are any clogged holes (especially nearest to the igniter), clear them with a stiff wire, or a straightened paper clip.
Part number: AP4012072