okay i bought my car from a guy. the cel was on. it has the gm stage 2 kit and a knn typhoon cai it says system to rich bank 1 i took it too the dealer ship they tested everything the maf is fine fuel pressure is fine they said i need a 02 sensor but they said they didnt know if that was the reason for that code some one please help i get horriable mpg and slow acceleration

 

most likely either a maf or o2 sensor. Seems like they are performing the right tests to diagnose a rich condition.

CAI and their "improved airflow filters" are notorious for destroying mafs because they don't meet filtering standards. hard to diagnose without seeing any live data.