Nick, It's not likely any sensor is faulty. My guess is that the flame on the burner cycles on then off a couple of times. Then cycles on, but there is no flame on the burner. This would indicate a weak gas valve coil(s)
Part number: AP3094251

Nick,
The coils are basically a wire wrapped around a cylinder, when power is applied to the wire, the coil becomes an elctric magnet and lifts the plunger inside the gas valve. If the wire develops a "weak" spot, it will cycle off and on until the weak spot separates and the circuit is broke, when the coil cools off th wire will make contact and operate until the wire gets hot and separates again.
If you have a multimeter, you can check the coil resistance, if you wish :
The two terminal coil should have a resistance reading of 1000 to 1,300 ohms resistance. The three terminal coils should have a resistance of 1300 to 1400 ohms resistance between pin 1 and pin 2 and 500 to 600 ohms, pin one to pin 3, when cold. Once you run the dryer until the flame no longer ignites and repeat the same test, I'm pretty sure you'll find no resistance on one of the coil circuits( if you're fast enough, or run the dryer long enough).

Thanks and good Luck,
:) :) :)

Nick,

Ok, so now you need to order the coils and get them installed. Your description, indicates the split coil(three terminal coil) is at fault, but replace them both.

:) :) :)