A12: Check For Heated O2 Sensor Continuity

With EM012 and EM021 disconnected, measure the resistance between EM012/015 and EM021/003

- Is the resistance < 0.5 ohms?
Yes
GO to A13 A13: Heated O2 Sensor Screen Ground Continuity
No
Inspect harness/connectors EM012, and EM021 for corrosion, damaged/pushed back pins. Repair as required and reconnect plug(s).
GO to A18 A18: End