C2: Check For O2 Sensor Failure

Run the engine for a period to warm the sensor & then maintain a steady speed of approximately 2500 rpm
Measure the voltage between EMO22/001 & EM022/002

Is the voltage between 600mV & 1.0 Volt?

Yes
Go to C3

No
Renew O2 sensor & reconnect plug(s)
Go to C6