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when people say to replace the o2 sensor do they meent o replace both of them, i was reading in the repair manual and the picture shows the truck has to of themm but it is a pic of the 4.7L i have the 3.9 v6 just wondering why noone says to replace both or just one?
ya, it's usually the 1st one before the cat that throws a code and gives you bad gas milage. but they always dont throw a cade. mine didnt throw a code till the truck would hardly even idle because it got soo bad, usually you can tell when your gas milage drops all of a sudden. I went from 20-21mpg down to 15mpg