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My first 4X4 received its first workout immediately north of the Prairie City SVOP where the mall complex is now. It was an Isuzu Trooper, 1990, and in 4-Lo could creep along at a pace slower than I walked. I rolled down the windows, and would hop out to open gates while it faithfully chugged...

It's called the Mojave Desert. Checkout TrailRecon YT videos.

I use the recommended 5W20 fully synthetic. No issues so far.

Mine connects with my phone within seconds. I have the same type of phone (Note9). My JKU is a 2016, and that might make a difference. Do you have a manual for your JK?

In addition to the axle, which was already mentioned, I would check that the drag link, track bar, and tie rod are all unbent. Then perhaps the control arms on the collision side. Then the frame, may be particularly the frame, since you have that cock-eyed thrust angle. An impact on the...

The "vertical" motion I mentioned is a loose feeling you might find by pulling alternatively on the top and bottom of the tire. If the bearing is the problem, the wheel assembly will feel slightly loose or sloppy. It shouldn't have anything to do with the shocks. Sorry if my remark was vague...

You might try lifting the right front tire and checking for any wobble, shaking it vertically and horizontally. I would be inclined to check for vertical movement primarily, looking for a worn bearing, or something close to the wheel and axle. Bump steering can be checked by standing on the...

With a Jeep, the real question is generally how much the repair will cost. I was T-boned in an intersection. The truck that hit me in the driver's door, but was stopped by the rock rails, was obviously totaled. The whole front end was caved in. My Rubicon was more or less still drivable...

The very first thing I would try is to go to an empty, level parking lot, aim at a point on the far end, and start the jeep rolling. Once you have stabilized the direction, let go the steering wheel and begin to accelerate slowly. Watch to see if the jeep shows any tendency to veer to one...

The main function of the down-stream oxygen sensor is to check the efficiency of the catalytic converter. You might want to test it, or have it tested, before the next time you have it smogged. It shouldn't have an effect, or at least not much of one, on the engine's running, but it might...

It certainly sounds that way. On a manual I would be having a look at the clutch plate, but automatics are a whole different world.

I would make a list of what I want on the vehicle. My own No. 1 item was a manual transmission, No. 2, mileage. No. 3, rock sliders. The stock sliders on the Rubicon saved my life when I was t-boned by a pickup and trailer. I walked away with skinned shins, and a bruise from the seat belt...

JScan is what I use, so far no issues.

Yep, it has become an old habit. ;)

The pristine plug is definitely worth a careful investigation. I forgot to mention the throttle body might need cleaning. But the plug sounds like a higher priority datum.

You might have to check the intake manifold. That code is not in respect to an "02" sensor but to an O2 sensor. O2 is shorthand for oxygen in its diatomic molecular form, necessary for combustion. Rough idles are definitely related to combustion, either oxygen supply or fuel supply. You have...

I would be inclined to look at the solenoid on the starter, and maybe the connector on the solenoid to the battery. Also, a very unlikely thing, is there oil in the starter? Long ago when dirt poor, I had a Dodge station wagon (the Mitsubishi-made Colt). It had a leaky seal at the back of the...

It sounds, from what you say, as if the rough idle goes away after it warms up. That could mean the spark is weak for some reason. I would suggest first clearing the code. Then starting the engine from a cold state. Wait for the rough idle, or check engine light to come back. Immediately...

The chalk test is a pretty useful tool. Draw a series of parallel lines across each tire. I've used anything from three to five lines. Then drive down the street, or in a big, mostly empty, parking lot for a couple of hundred yards at least. Then inspect the sets of lines on each of the...

Odds are you are doing a lot of short range, low speed driving (city) or you spend significant time on high speed freeways or similar. The maximum mileage for me is county roads and state routes at about 55 mph, where I can hit around 25 mpg. The DTE will vary up and down during the use of a...