97 expedition code
Thread Starter
|
New User
Joined: Feb 2005
Posts: 12
Likes: 0
97 expedition code
i got a check engine light on and went and had it checked out...the mechanic told me that bank one was running lean...he checked what the oxy sensors were reading and he said sensor on 1 was reading rich and lean...back and forth...then he said sensor #2 was reading rich all the time...he recommended changing the oxy sensor and i did but the check engine light came back on after about 30 mins of driving...can someone give me some info on maybe why this is happening....thanks
Posting Guru
Joined: Sep 2002
Posts: 1,264
Likes: 0
From: North Carolina
Originally Posted by rudace
i got a check engine light on and went and had it checked out...the mechanic told me that bank one was running lean...he checked what the oxy sensors were reading and he said sensor on 1 was reading rich and lean...back and forth...then he said sensor #2 was reading rich all the time...he recommended changing the oxy sensor and i did but the check engine light came back on after about 30 mins of driving...can someone give me some info on maybe why this is happening....thanks
Posting Guru
Joined: Sep 2002
Posts: 1,264
Likes: 0
From: North Carolina
Originally Posted by rudace
thanks for the info....when you said you have to change the oxy sensors in pairs do you refer to both on one side? thanks again
New User
Joined: Sep 2004
Posts: 20
Likes: 0
Do not change the O2 sensors before checking for a vaccuum leak. I would bet that you have a leak in the PCV elbow where it attaches into the intake manifold. This is easy to check and replace and cheap too! Reach all the way to the back of the engine, top, rear, center. You will feel a rubber elbow. I would bet it is rotted and leaking. It can be removed by just pulling it out. No tools required. Purchase a PCV vaccuum line at the dealer for $30 to $50 depending on the engine. You will get the entire line but you only need to replace the elbow. Thousands of O2 sensors have been sold by dealers when the only problem is this rubber elbow. Bad O2 sensors will bring on more than just a lean bank indication and the mechanic should know that. Let us know how it works out. Good luck!
