Mustang Evolution Forum banner
1 - 1 of 1 Posts

· Registered
1,158 Posts
Have u tried replacing the upstream o2 sensor yet? I have the same code plus one p0171 and p0174 and u can tell im not running lean im running pig rich however i still need a tune and i eliminated the rear o2s so i still have yet to replace my o2 upstream. Just an idea. It could also be a vacuum leak as well so look for that as well
1 - 1 of 1 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.