Dan03

Looking at buying an S3, the seller says it has a sports cat but with a stock ecu so it has a warning light. He says the car runs fine with the warning light, is this true? I would've thought it would run badly because the emissions are higher than what the ecu wants to see? He also says he bought it with a stage 2 map but then changed it back to stock and apparently it ran with no issues. Not sure I believe him, is this possible? Thank you in advance.

Looking at buying an S3, the seller says it has a sports cat but with a stock ecu so it has a warning light. He says the car runs fine with the warning light, is this true? I would've thought it would run badly because the emissions are higher than what the ecu wants to see? He also says he bought it with a stage 2 map but then changed it back to stock and apparently it ran with no issues. Not sure I believe him, is this possible? Thank you in advance.