O2 sensor, I can't find it?
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Junior User
Joined: Oct 2003
Posts: 82
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From: Mentor, OH
O2 sensor, I can't find it?
I am looking to replace my O2 sensors on my 2003 F250 5.4. I went under the truck to see how long the wires are on them to get the right length since there are different sizes. I can only find two sensors on the truck. One on each side of the exhaust manifold. I keep finding stuff(part stores, manuals) that says there is a down stream sensor--which is found after the cat--Right? but I can not find any other sensors. Is there not really any other sensor or am I just having a bad day. 
I looked and felt all down the pipes and could not find it. Please can someone clear this up for me.
Thanks, Michael
I looked and felt all down the pipes and could not find it. Please can someone clear this up for me. Thanks, Michael
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
If your truck was manufactured and rated for > 8500 GVW, it doesn't have downstream O2 sensors.
Check the 4th digit of your VIN. If it is N, S, W, X, A, H, J, K, L, or M, it is in this class and thus exempt from the full OBD-II requirement.
Steve
Check the 4th digit of your VIN. If it is N, S, W, X, A, H, J, K, L, or M, it is in this class and thus exempt from the full OBD-II requirement.
Steve
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