i have an new ntk 23506 o2 sensor Pre-Cat Left for 99 dodge ram 5.9l. I though I had 2 pre-cat o2 sensors but only had one and cant return it to amazon because its been opened.
35$ shipped to any one that wants it.

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note if you only have one pre-cat and post-cat o2 sensor this will not fit as it too short.

 

can you please post some pics of it? As for it being too short, on my Ram when I put in long tubes I cut my O2 wires on the sensor and extended them and used 3M heat shrink butt splices and then more heat shrink over the splice again. We have four wires on ours (3rd Gens) so maybe this will help you sell it.

 

I don't mean to detract any potential buyers, but splicing it's not worth it when you can a longer ("18) O2 sensor for $55 brand new. Just sayin'...