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Something set it on. Some conditions will send this as an alert, but the engine will still run. It is not optimum and usually then puts the computer in "open-loop" instead of "closed-loop". Closed-loop is when all is functioning as it should and the sensors are feeding good data to the computer so it can monitor fuel mixture for optimum. In open-loop, the computer "guesses" at the fuel mixture so usually uses more fuel than neccessary. The way to find out why the lite came on is get into the computer & see what codes are there. 1996 & newer use OBD II as a standard. Pre-1995 are OBD I and cars differ in how to get the codes from the computer & decipher them. Hanes makes a good manual that is not outragious (about $15). It should tell you how to get at the codes & what the code means. If you still cannot figure it out, take it to a good Jeep mechanic to diagnose & fix but yes it will cost. You might also try an OBD I scanner, I have seen them for about $30-50 depending on the features. My older 1991 has a diagnostic port on the fire wall driver side. I am not sure if the 1995 does, but I do know they have a different computer system between the 2 of these years. I think the 91 & 92 were same then they changed from 93-95. Hope this helps

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