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DTC P0421: Warm Up Catalyst Efficiency Below Threshold
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TECHNICAL DESCRIPTION
The signal from the heated oxygen sensor (rear) differs from the linear air-fuel ratio sensor, because the...

According to post #3 above Fummins says he replaced a catalytic converter and oxygen sensor to clear the fault.

The Green A with the circled arrow around it is the "Auto Stop & Go" feature. When activated the engine will automatically shut off while at a stop light, or in heavy traffic to save fuel. When you...