I have battery voltage on the yellow/red wire to the sensor, ground at the grey heater wire and good ground on the brown/black wire.
No voltage from the blue wire on the sensor, FWIW the heater monitor did pass on the scan tool so I know for sure the heater is good, it ohms out as well.
On the ECU pins I have continuity on the blue signal wire from the ECU to the sensor, same goes for the gray heater wire, power and grounds are good. So That made me think the ECU may be bad, shorted internally. Swapped in another ECU and still nothing.
I'm completely stumped, the vehicle has a brand new NTK oxygen sensor (front) so I HIGHLY doubt the sensor is bad, wiring seems to check out, so what else am I missing?
Only other thing i can think to try is running a jumper wire in place of the blue wire to rule out being shorted or open somewhere.