H15: Check For O2 Sensor Continuity

With EM012 and EM024 disconnected, measure the resistance between EM012/016 and EM024/002.

Is the resistance < 0.5 ohms?

Yes
GO to H16, H16: O2 Sensor Screen Ground Continuity

No
Inspect harness/connectors EM012, and EM024 for corrosion, damaged/pushed back pins. Repair as required and reconnect plug(s).
GO to H21, H21: End