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Do that sooner than later because a few sites are marking the upstream NTK 23151 as discontinued. They might be out of stock everywhere soon.
Thanks for the info folks. I'll let you know how it turns out after my smog check.
I did some searching and haven't been able to find an answer.
Are the actual sensor parts of of the upstream and downstream O2 sensors the same and is it just the wire harnesses and connectors that are different?
I found NTK O2 sensors part numbers for my 1999 XJ sport:
23151 upstream...