E2: Check O2 Sensor Heater Continuity

Ignition switch to position 0
Disconnect EM023
Bracket on top of gearbox or Bulkhead rear of engine
Measure the resistance between EM023/001 and EM023/002.

Is the resistance between 4 and 10 ohms?

Yes
GO to E3, E3: Check For O2 Sensor Failure

No
Renew O2 sensor. Reconnect plug(s)
GO to E7, E7: Heated O2 Sensor Short Circuit To Ground