2007+ Expedition & Navigator2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator
Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.
You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!
Unless you have a scanner that can monitor the O2 sensors, I would replace the sensors. The ECM monitors front and rear sensors, and compares readings to determine if the converter is doing its job. Does the vehicle have, or ever had, a misfire problem? If not repaired quickly, the converter can be damaged and cause a cat efficiency problem that may not show up for some time
2013 Explorer Limited
87 Ranger, XLT
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.