95 jeep cherokee donkee limited warnind horh two beeps and two beeps

SOURCE: no warning buzzer that my lights are on

the 1999 elantra was not equipped with a warning buzzer for the headlights, if you leave them on.
the headlights will turn off if you shut the car off, but the parking and tail lamps will remain on

SOURCE: alarm activated,lights are flashing can't start vehicle

if alarm is activated, it could be shutting off the starter, hence no starting....you may have to have a locksmith or electronics place disable the alarm so you can at least drive the thing

SOURCE: 1999 jeep grand cherokee all time four wheel drive will not engage

Sounds like the splines on your transfer case gear are ground down

SOURCE: I have a 2001 Jeep Grand Cherokee - Limited My

That's a generic O2 sensor circuit overvoltage warning. Did they find any additional codes? Also, did they clear the code for you? Your car is an OBD2-emissions car, meaning you'll have an O2 sensor before and after each catalytic converter. Is your engine the V8 or the inline 6? If it's the V8, you'll probably have four (although it could be two or three) O2 sensors. If it's the inline 6, you likely only have two. I'm asking about additional codes because that one doesn't help narrow down which sensor is bad. Have you noticed your gas mileage dropping at all? Or a buildup of black carbon soot in the tailpipes? Maybe less power than usual? If so, it's probably a primary (pre-cat) O2 sensor. Those are the ones that determine how much fuel the engine will be fed. If you don't have any discernable difference at all, it's probably a secondary sensor (post-cat). The issue I have is, either of those should throw at least one additional code (either to indicate which sensor is going bad, or in the case of a secondary sensor, you'll usually see a "catalytic converter below threshold" or similar code, since the secondary sensors are used by the computer to see how well the cats are working).

Any additional codes in there, or symptoms you can describe?

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SOURCE: HOW TO REPLACE TIMING CHAIN ON JEEP GRAND CHEROKEE

email me and i can send you pictures and instructions. [email protected]