Originally posted by rvoth:
I replaced mine a few weeks ago. Huge difference in gas mileage and driveability!


- Randall


Hey RAndal,
I also replaced my two upstream o2 sensors, but have almost no difference in gas mileage, how much did it change for you?,
currently I have about 21, before 20,
any idea to improve mileage?, I am thinking in change plugs and oil change soon, any other ??


1998 Contour V6 2.5L ATX