Cowdoodi it has the cups on the middle cylinder head.

Installed a new sensor module on the right side yesterday, no change.
Installed the new module on the left side, fixed!!

So, the original fault was accurate, despite the seemingly consistent behavior of the LED on the module, it apparently wasn’t transmitting the signal to the controller.

Quite relieved to see it run without faulting out!

Thanks everyone for your expertise!!