Suzuki Swift P0420 - Catalyst Efficiency

In a live diagnosis we show you how to interpret scantool data to test catalytic converter efficiency for the all to common P0420 fault code.
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[@fleettech3570]

I have a mazda bt50 and when I unplug my maf sensor plug the engine does not shut off

[@fleettech3570]

The mazda drives like normal but it uses a little more diesel than normal. Is my maf bad or dirty