O2 Senser????
New User
Joined: May 2006
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sorry to steal your thread, but I have a 98 5.4L and my check engine light came on, and got the codes read, and am going to replace my o2 sensors. Well I bought 2 of the bosch o2 sensors, and I got underneath it and found 4, 2 right after the manifolds, and 2 after the cats. I figured the main ones are the ones after the manifolds, but what do the other 2 do?? And do I need to replace them as well??
I did some searching on this forum and found this post...
"The pre-cat sensor is used to adjust the fuel trim, the post-cat is used to simply monitor the cat efficiency, correct?"
Also I know they come in different wire lengths, but are they all the same besides the lengths of the wires??
Thanks
I did some searching on this forum and found this post...
"The pre-cat sensor is used to adjust the fuel trim, the post-cat is used to simply monitor the cat efficiency, correct?"
Also I know they come in different wire lengths, but are they all the same besides the lengths of the wires??
Thanks
Senior User
Joined: Feb 2004
Posts: 163
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From: Columbia, SC
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