2004 jeep liberty.coolant sensor and t-stat replaced after auto zone free diagnostic was done.no air in system.check engine light still on .140 miles put on vehicle since repairs.3 or 4 cold starts since repairs .battery was stone dead before trouble .does owner just need to drive it .or just a few more cold starts to get a reset of engine light .disconnecting battery is not the answer.2.4 litre

SOURCE: 2004 liberty

If your engine light came on, the engine module could have stored a code.
You need to have a scanner to check what code it is and that will point you toward the solution.
Possible causes could be (crank sensor, tps sensor or oxygen sensor).
Don't go replacing parts until you scan the vehicle for codes first.

SOURCE: 2008 Jeep Liberty-Dead battery issues w/ a new battery

Unit has a draw somewhere that needs to be addressed. I have found the auto starts sometimes can cause this. But if the draw is through the negative side it could be tough. You should take it to the dealer and have them perform a draw test on the entire vehicle.

SOURCE: Engine light comes on 2003 Jeep grand cherokee laredo

Check the Fuel Pump Relay, it may be malfunctioning and need replaced. Also, in some vechicles, if the batter is disconnected and reconnected, the service engine light will come on from time to time, going off and on simultaneously. Have a diagnostics done to see if any codes show up. If no codes appear, then have them all cleared and drive for another 200 miles. Sometimes the computer will need to be cleared a couple times before the light will stay off. Make sure that all fuses and relays are good, and securey in place. Check all factory installed lights to make sure they are good, and securly in place as well.

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: Have a 2005 Jeep Liberty. After starting from a

The flashing light indicates you have a big misfire that could damage the catalytic converter.. Being you were going uphill (under high load) this would indicate an ignition issue. You may have a bad coil or wires or a bad spark plug. The reason you could only go 30mph was because the computer was put in limp mode. This is a stratagy to prevent excessive damage to components. , Get it checked out ASAP