Pretty much all electronic code readers will give the location of the problem either on screen or by included software. The Haynes or Chilton manuals are a good place to start for how to fix the problem.
Of course, if your Jeep isn't throwing a code and thus lighting the CHECK ENGINE lamp, it is moot. Unless there is an intermittant trouble code that the computer stored. If the Jeep has been sitting and the battery got drained (thus you had to jump start the Wrangler to get it running), the code is gone.
An option, instead of spending $25 on a Chilton or Haynes manual, check your local library. I bet they have a copy of whatever book covers your Jeep.
Shops often charge a high price to take a reading with an OBD code reader. Your local O'Reilly's has a simple one as low as $69 (OBD II only - your Jeep might OBD I; OBD II was just being introduced by some manufacturers on certain models in '95). About what some shops charge to simply take a reading. Or go to your O'Reilly's and ask them for a suggestion to a shop for a reading. Often some of their commercial accounts will give a substantial discount if you tell them O'Reilly sent you (we used to do it ourselves for free but got our OBD units taken away some months ago because of a California lawsuit).
O2 sensors aren't cheap, pretty much all are over $100 each. There are generally two in each vehicle - one before the catylitic converter and one aft.
Start with the cheap fixes first, such as a good inspection underhood for critter nests, dirty air filters, stuck PCV valve, some sort of pluggage in the exhaust tract (small mice like tailpipes), etcetera; and a couple bottles of fuel system cleaner. Then if that doesn't work, work your way up the cost/labor ladder.
_________________ D.A. Wright ~When You Live in Nevada, "just down the road" is anywhere in the line of sight within the curvature of the earth.
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