A sensor under the console of my 2012 F-350 went out. It cuts the engine when it senses a rollover.
Damn thing cut out as I was going around a roundabout
$650
I bet if you googled it (or youtube) you can find a hack to disarm it. I had to replace the starter on my wife’s new van. (She drove the old Buick for a couple of days!) It was just the starter - but their were lots of hacks if it was one of the safety sensors that prevented the ignition from activating the starter.)
https://www.thedieselstop.com/forums/f23/no-start-push-reset-emergency-fuel-shutoff-starts-159793/
I have no idea if the above link is related to what you are dealing with.
Car repairs are such a ripoff if you have the time and some tools. It looks like replacing this inertia switch is pretty easy with a screw driver as all the tools you’ll need.
Diagnosing and replacing my wife’s starter cost $110 in parts (rebuilt starter) and probably 5 hours of my time. I didn’t know anything - so I learned something too. The mechanic would have charged probably $600 to $800.
It was actually an interesting project. By all accounts the starter seems to work (out of the engine it seemed to run just fine!) But everything else in the ignition circuits checked out - and the engine wasn’t frozen - so it must be the starter. Then, when bench testing the starter I noticed the gear didn’t retract when it should have once. So I’m guessing something was a bit “sticky” and it wasn’t engaging or releasing from the gears in the engine.
Although it wasn’t until I installed the new starter that I was 100% certain. (I was 99% sure though when I bought the new starter).
BTW - Amazon has inertia switches for $50 to $75.
You should have told them to bypass it not replace it.