When cold, the engine is working in open loop and this has nothing to do with lambda sensors.
Afaik, KV6 doesn't have a MAF.
ECU can be fooled if the temperature sensor is not working properly and the ECU decides that it's hot, unlikely but possible.
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Renee Descartes walks into a bar, the bartender says 'sir can I get you a martini 'Descartes says 'I don't think...' and he disappears
Cheers,
Fidel
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