P0420 trouble code Bad gas milage Help!!!
I have a 2001 Olds Alero that has the trouble code P0420 and it is only getting about 19 mpg. The catalitic converter has been replaced, then the light went on again. Dont know to go from here need some help. I have a scan tool and this is what it reads. P0420 Catalyist System Efficency Below Threshhold (Bank 1)Freeze Frame Data----- Fuel sys 1 --OL , Fuel sys 2-- CL-Fault, Calc Load % 18.04, ECT (*F) 188 , STFT B1 (%) 0.00. If anyone could help it would be most appericated. I got this car to help with gas milage and it doesn't seem to be getting that good of milage, it should get about 26-28 mpg what could be wrong? To get the milage up to where it is suppose to be. HELP please. Thanks Rick