2001 is 300
The car shut off on me the other day.
Would crank no start assuming it was the fuel pump I ran home took the pump out of my other IS both are 2001.
After installing that pump had the same issue.
I looked around for a while found the efi 25 amp fuse was blown I replaced it car fired...
TL : DR
Car wouldn't start. Switched EFI/HORN relays and car would start, but horn still worked.
Car died a few days later and would not restart.
Shop determined it needed a fuel pump/filter/pressure regulator/ and relay. We replaced all. ($1266 after tax... oof!)
With new pump the car...