What happens if an opponent’s card tries to scrap a Weapon and an Armor from the upgraded character at the same time? Can Spare Parts save both of them?
[Source: WotC] 
No, Spare Parts can save only one other Upgrade. You choose whether it saves the Weapon or the Armor. Spare Parts and the other Upgrade will be scrapped.
If I have Autobot Hot Rod with the AirQuake Hammerclaw, Spare Parts, and
Bashing Shield equipped (and no other equipment) and my opponent hits me with a Bashing Shield of their own, am I required to scrap the Spare Parts?
[Source: WotC]
Yes. Their
Bashing Shield would try to scrap your Bashing Shield, and Spare Parts would heroically leap in the way. Using Spare Parts in this scenario is not optional. Thank you, Spare Parts.
How do Spare Parts and
Salvage for Parts interact with each other, Salvage being played by my opponent, and Spare being on my own character?
[Source: WotC]
If the character with Spare Parts has a weapon and/or an armor, Spare Parts will save one of them. Spare Parts won’t count when determining how much damage to repair.
Okay, so you've stated in the past that your opponent's characters count as "cards" when referring to Motormaster rulings. I was wondering, with regards to Spare Parts (which scraps itself instead of another Upgrade attached to your character) and
Force Field, would a character attack count as a card causing Force Field to discard? In other words, if your opponent attacked an upgraded character with both a Spare Parts and a Force Field with enough damage to trigger the Force Field's effect, would you scrap the Force Field or the Spare Parts?
[Source: WotC]
You would scrap
Force Field because its ability is what causes it to be scrapped, not your opponent’s attack.
I have a character with a weapon and Spare Parts. My opponent hits me with
Disarm or
Debilitating Crystal. Is the weapon returned to my hand or does Spare Parts get scrapped, or returned to my hand instead?
[Source: WotC]
Same scenario, but my weapon is a
Battle Master/
Weaponizer.
In both scenarios, Spare Parts does not protect your weapon. A Battle Master or Weaponizer in weapon mode would go to KO rather than to your hand.
So on Spare Parts it says after each battle you may swap 1 card from your hand with one of your flipped green pip cards, is this just a printing of the base rule, or a card effect that lets you swap out a second green pip?
[Source: WotC]
That’s just reminder text for anyone who may have forgotten how the green battle icons work.
For
Grapple's abilities: Does he need exactly 4 different battle icons, all with different colors or just amongst all battle icons flipped/scrapped does need to be exactly 4 colors?
[Source: WotC]
You can scrap any number of cards with any number of icons from your hand, they just need to contain four different colored battle icons among them.
Grapple’s ability would work if you only scrapped a
Roll Out! and a Spare Parts, for example.
If my
Predaking attacks with 5 weapons and a Spare Parts, and my opponent reveals a Sabotage Armaments Secret Action, what happens? Does the Sabotage Armaments scrap Spare Parts only or does it scrap only 4 of the Weapons and Spare Parts?
[Source: WotC]
In this scenario, you could use Spare Parts to save one Weapon of your choice.
How does Spare Parts interact with
Vandalize? If my opponent plays Vandalize, and I have 1 bot with Spare Parts and a
Grenade Launcher equipped, are both upgrades scrapped? Or does Spare Parts absorb the destroy effect targeting Grenade Launcher, even though Spare Parts is already being destroyed simultaneously by Vandalize?
[Source: WotC]
Vandalize scraps all your opponent’s weapons OR all their armors OR all their utilities. If your opponent chose to scrap weapons, Spare Parts would be scrapped instead.
However, if a card did try to scrap Spare Parts and
Grenade Launcher at the same time, Spare Parts could save your Grenade Launcher.
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