2006 Jetta Starts and immedietally dies

Last week left the key on while camping and killed the battery. Would start from a jump but not stay running. Bought a new battery and it ran fine for a week.

Let it sit for 2 days and now it’s acting the same. Turns over fine and fast, will sometimes fire but dies instantly.

Checked ASV, appears to be operating normally. Also unplugged it for foot measure.
Tried to jump it, no change

Unhooked battery for 5 mins and rebooked, no change

Can hear the fuel pump come on under the back seat when the key comes on.

Tried a different key.
Tried manually unlocking the door with the key Incase it was a security thing.

Any ideas? Looks like I’m stuck at Michigan International speedway for the night. At least there’s beer.

Well as always, OBD works, I'd start there.

You may have an ignition switch or load reduction relay going bad, though.

Also make sure this is not an immobiliser issue.

Update on this: Ended up finding a worn through wire for the Engine Speed Sensor in the wire harness right above the Starter.
Easy fix, pain to find.