SOURCE: 2002 V6 Jeep Liberty-Oil Pump Replacement
Yes you have to check your pressure with a mechanical gauge first. If the pressure reading is good replace the oil pressure sending unit. They are known to go bad, and oil pumps going bad is rare.
SOURCE: airbag light stays on 2005 jeep liberty
It probably will cost a few bucks to get the code reset, but you don't need to go to the dealership, most shops with a good scanner equipped for air bag code reading will be able to diagnose and reset the light. The most probable reason for the code is the battery being dead for a while, there is a capacitor in the airbag circuit to make sure the airbag can go off in a collision even if the battery disconnects itself in the process. There is a slim chance it might be something else but either way the shop should be able to tell you what the problem is, and get it fixed... But, just for fun, before doing all this, i'd disconnect the battery for 30 minutes to an hour and reconnect it back, some systems do effectively reset themselves this way.
SOURCE: 2002 Jeep Liberty oil pressure light comes on in cold
Chrysler mounted the oil sensing unit on these motors directly above the oil filter. It is very easy to accidently hook the sensing unit with the oil filter wrench and crack or break it. For anyone whose oil light problem developed right after an oil change, this may be the problem. To change the unit, pry up the plastic retaining clip with a screw driver and unplug the wire harness. If the plastic part of the sensor is broken, (or if you break it to facilitate easy removal), you can remove the sensor with a 27mm socket. Once you have removed it, use a piece of CLEAN pipe cleaner to insure the hole isn't plugged with sludge which could also cause the oil light to come on. Screw in the new unit finger tight, then snug up with a WRENCH. You cannot use the socket to tighten it as it would damage the plastic part of the new sensor. Plug the wire harness back on, then start the engine to make sure it doesn't leak oil around the new unit.
SOURCE: 2002 jeep liberty speedometer stopped working
I had similar problem with my 2002 Jeep Liberty when it was new. Speedometer went crazy when I turned on the heater. As i turned up the level of air, the speedometer was directly affected. Turned out it was a loose grounding wire in the dash, and the air pressure from the heater caused it to move and lose grounding. I would guess you have a loose wire somewhere. But on the plus side, you aren't putting as many miles on your odometer...
SOURCE: 2005 DIAGNOSTIC ERROR CODE P0069, CRD ENGINE WONT
Are you traveling high ground like Rocky Mountain?
I will remove the ground cable for 4 minutes to reset all data in ECU.///clock and radio stations too : (
Let the ECU to relearn the local environment parameter.
Here's so info on how to prevent vapor lock
Ride with full tank of gas but NO TOP OFF.
Crack open gas cap carefully during rest stops to release / equalize gas tank pressure'
http://www.estes-park-information.com/vapor-lock.html
Good Luck
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