which oxygen sensors upstream or downstream
upstream= before cat, downstream= after cat.
O2 might not be the problem, only detecting the problem. Do you have a misfire and vacuum leak? Scan for codes.
Bad O2 sensor will not stop car from starting or idling. As Tom said, scan for codes.
Looking for a Used Windstar in your area?
CarGurus has 586 nationwide Windstar listings starting at $3,500.
Search Ford Windstar Questions
Ford Windstar Experts
Related Models For Sale