H10: O2 Sensor Short Circuit to Ground

With EM024 disconnected measure the insulation resistance between sensor pin 001 and sensor body. Repeat for pin 002 and sensor body.

- Is the resistance > 10 M ohms?
Yes
GO to H12 H12: Signal Ground 1 Continuity
No
Renew the O2 sensor and reconnect all plugs.
GO to H11 H11: Stop