4wd light flashing and check engine light

Hey I'm new here
I have two automatic Jimnys ( 2004 )
My first one is dying a death, so keeping for spares.
This weekend I collected a second one in seemingly excellent condition.. though after driving her 250km on various roads to get home the 'check engine' light came on.
She seems to be running smoothly despite this.
The more worrying thing.. I tried her 4wd on a forestry track this evening. All ok. Back into 2wd for main road and that's when issue started. Noise at first, then I felt 'discontented'(?) movement under the front centre of car. She lost speed and seemed to lose power and fluidity in wheels.
Got her home.

I just checked her in park with engine on and tried the 4wd gear which is now flashing.

Sorry this is so long winded! I'd like to know if it's safe to drive her tomorrow to a mechanic?
I believe I'll be needing help and advice from you all..

I switched to 2wd in neutral with wheels straight but I didn't know about the reversing trick. Beige one had no problems with it.
That sounds about right.
I'll see what I can do without driving. Thanks so much!

You're assessment was perfect. Left front wheel seized. Lucky I have good spare parts from my old jeep to get back on the road today cheers again for that

It stopped moving altogether. Inside the wheel the brake was pushed up against the brake pad and kingpin axle (?) little plate and spring ring were completely mashed and broken.
Lucky I had a working jeep to replace the broken bits with and a patient mechanic.
It's sorted now I'll try not to wreck it again
Yes, I've had a read through now, the articles are brilliant. Lots of advice, if I can't find what I'm looking for I'll be back with any more questions
Thanks again, so good to know where I can get Jimny help!

Added a pic of the broken bit and the good replacement.

i can help, i,ll get to the bottom of this over a beer no problem!!