Decat lambda debate

Cambaines

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Me and my mate both have EML on through decatting, My mates a mechanic and I feel silly arguing wit him but am I right in saying that if lambda one has got wrong readings then the ecu will change the fueling accordingly but if lambda 2 is out like mine is then the car will throw up an EML but not change the fueling through to a potential faulty cat?

Who's right here? I'm hoping I am

Cheers Cameron
 

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