Emission Control Warning Light

EF MAX

Member
I have a mate with a petrol A2 but he has no computer access at the mo.. his car has jusr gone out of warranty and the DIS as thrown up an engine sign with the "emission control warning" message.

What does this mean.. He has been using super unleaded up until recently and "not sure why" he has gone back to normal leaded.. any clues.. TIA
 
I have usually found this means the MAF sensor needs cleaning or replacing and or the Lambda sensor is faulty.
 
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