O2 sensor locations

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Jgc1986

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Where are the O2 sensors located on a 2002 Dodge Ram? Pictures would be great, thanks!
 

Core-Lokt

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No pictures needed-they're easy to find. The oxygen sensors are on the exhaust system. You'll see a wire harness going into the exhaust pipe. IDK about early 3G trucks, but I *kinda* think there is only three sensors. Mid-later 3Gs for sure have four; upstream and downstream of the catalytic converters for each bank of the engine.
 
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Jgc1986

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P0138 O2 Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2)
P0037 O2 Oxygen Sensor Heater Control Circuit Low (Bank 1, Sensor 2)

I guess I needed to be a little more specific. I am getting the codes above, and need to know which one is Bank 1, Sensor 2 specifically.
 

chrisp2493

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Bank 1 should be driver side, bank 2 should be passenger side. Sensor 1 is upstream, sensor 2 is downstream. So it should be driver side downstream (after cat)
 
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Jgc1986

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Well I found the reason for my P0037 and P0138 bank 1 sensor 2 O2 codes...pictures should tell the story here...

Now, what the hell am I supposed to do with this?!

IMG_20170711_173454.jpg
IMG_20170711_173404.jpg
 

chrisp2493

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Isn't that just a sensor plug? Are the threads still good? Is it an aftermarket exhaust setup?
 

chrisp2493

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My guess is someone had a bad sensor, found out they cost about $60 and just eliminated it. If the wire harness is still around, just put a new sensor in and plug it in.
 
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Jgc1986

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Isn't that just a sensor plug? Are the threads still good? Is it an aftermarket exhaust setup?

Yes I believe it's aftermarket exhaust


My guess is someone had a bad sensor, found out they cost about $60 and just eliminated it. If the wire harness is still around, just put a new sensor in and plug it in.

The sensor won't fit down into the hole so I got to get that top part off I believe.
 
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