Ok, thanks for your patience. I was out last evening after work and did check my phone for a few things on Just Answer, but I didn't get back until very late... The part number for the evaporator sensor is(NNN) NNN-NNNNand it looks like it is going to cost 12-15 dollars. You can order it from any parts vendor online. Good luck.
PART NUMBER: WB13T10038
It is generally Just Answer's policy to answer only one question per product, however...
As a favor to you, I will tell you that when a module fires, ALL the ignitors fire unless you have a several thousand dollar stove with an auto single reignition system, which you don't.
If the module is firing, it IS NOT bad. If the old one was firing, It WAS NOT bad. The problem is in one of the burner switches. The switch is a momentary circuit. When closed, it allows the 120vAC through to the module, when the switch is open, it stops the 120v and stops current flow. One of your switches is bad. Which one? I generally replace them all at once so every one is new and fresh. Sometimes they come in a daisy chain with all of them, sometimes they're sold individually.
I can't really go further with this part of the question. Honestly, we're not supposed to do it and I do have rules to follow. I hope you understand. If it relates to the original question posed, then it's not an issue. Thanks!