while were talking about o2 sensors and dealers , our Windstar had a CEL about a week ago lean codes 171/174 IIRC any way we bite the bullet and take it to the dealer because its still under warranty(extended) till the end of the month and the covered it to my surprise, intake gasket leak and valve cover its a TSB that probably should be a recall I was expecting them to say it needs plugs wires tune up ect .not covered and blow me off till the warranty was over:shrug:On the other hand they did charge us 50 dollars to say they couldn't find out why the ABS light comes on sometimes:nonono: