my buddy had his check engine light come on and took the truck to the dealer. the dealer said it was the driver side o2 sensor mounted on the exhaust manifold. They told him 520$ to replace it
and that most of the time, the heat from the exhaust will melt the 02 sensor in place and they will have to replace the manifold also. they said it could cost up to 2000$
Sounds like a load of SH@@ to me. anyone else have any opinions.