2002 jeep oil light comes one when it is cold outside. as vehicle warms up (20 miles) or the engine slows down (stop lights) the light goes off. Mechanic has change oil light sensor, changed oil, said pressure is good, changed oil. light still comes on. changed sensor again, pressure still good but light still comes on.

SOURCE: oil pressure gage

At idle, at operating temp is there any ticking from top end of engine? Are there any knocking noises brom bottom end?
If no noises, change oil and add some Marvel oil to clean out galleys. If that dosent work, change oil pressure sendingf unit. Also, if you have a mechanical oil pressure gauge, hook it up and take a direct reading. Oil pressure (in any vehicle) at idle should NEVER be less than 15psi. Generally in 4.0 jeep engines it's never less than 30, with a high reading at driving rpm of about 40-60! (but, you did not mention what engine you have)

SOURCE: Car Runs and Loses Power and Quits Running

Try cleaning the fuel pump filter. Under the seat behind the driver lift the carpet and you will find a round cover with six screws remove the cover. The fuel pump is directly below unscrew the retaining round plate and remove the pump. At the base of the pump is a small filter if it is covered in black muck that's your problem. clean and replace. job takes about 10 mins good luck. please let me know how you got on!

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SOURCE: 2002 jeep wrangler oil pressure gauge drops

When the gauge is at 0, is there any noise from the engine (tick, knock etc?) I would have someone put a mechanical gauge on there and read true pressure.Your driving pressure seems OK but if the low number is "real" something is wrong!

SOURCE: Kia Sedona stopped running.

When is the last time you changed the oil? It sounds like you have gummed up your motor.

SOURCE: 2002 kia sportage airbag light flashing 1 -3 code,

first thing to check, how is your battery? Are the battery posts clean? next check your fuses. replace as needed. sometimes if an aftermarket stereo has been added, the wront power cord may have been splice. need to get the exact coce and find out what it means. i have never heard of a 1-3 code, usualy there are in the form of T0222 or T444 or something close to that.
hope this helps a bit, the actual error code would help quite a bit