Lost the 02 sensor wiring harness connector - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 07-05-2014
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Lost the 02 sensor wiring harness connector

kind of a dumb question, but here goes. After putting the trans back in, and rehanging the exhaust, I was able to locate the connectors out of the main wiring harness to plug in the driver's side front and back 02 sensors. However, I cannot find where I am supposed to plug in the passenger side 02 sensor. Does the plug come down from the passenger side of the engine compartment? Where should I be looking to find this? the truck is a 2003 XLT 4WD with a 4.0. Thanks.
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Old 07-06-2014
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Upstream O2 sensor wires are usually located in the wiring harness on the firewall behind the engine.

Are you sure the "back" O2 sensor wire wasn't the passenger side O2 sensor wire?
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Old 07-08-2014
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The 95~2003 Ranger 4.0's have 3 O2 sensors. There is 1 sensor for each of the 2 cylinder banks and these are upstream of all cats. The third one is for cat efficiency monitoring and it is positioned after one or more main cats.
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Old 07-10-2014
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Quote:
Originally Posted by RonD View Post
Upstream O2 sensor wires are usually located in the wiring harness on the firewall behind the engine.

Are you sure the "back" O2 sensor wire wasn't the passenger side O2 sensor wire?
Thank you Ron, The missing wire was exactly where you said it would be. However, when I bolted the trans back up to the engine, I managed to sandwich this wiring between the engine and the bellhousing. At least I know where to find it! haha.
Ken
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