B Bill F New member Jan 17, 2010 #1 my gas mileage has been going down and my check engine light came on both o2 sensors were showing fault codes i am going to them changed would this have effected my mileage
my gas mileage has been going down and my check engine light came on both o2 sensors were showing fault codes i am going to them changed would this have effected my mileage
B Brian D New member Jan 17, 2010 #2 yes the o2 sensors can cause the computer to dump more fuel. I would also change the spark plugs.
