I have a 98 jeep XJ

What country are you in, USA/? we are
what engine is there, ? we have like 2, but more outside USE
must we guess both facts?
so the engine runs great that it, all things ok but the trans fails to shift due to obvious , limphome (limp-in) mode ! that it?
You just want shifting to work, right>?


what is the nss, ( that is not an SAE.org legit term)(VSS???)
(sure tranny bad , VSS swapped, but was not it)
sure.... as is the case most times here. not scanned correctly

first off learn rule one on EFI cars
you can NOT ERASE problems, or you can't erase REALITY.
problems are cured then , you push reset and see if they return
if they DO? THEY ARE REAL and must be corrected.

p-700 means do a full scan of the Tranny TCM to see all errors there
you scan tool is weak. my guess and can not do jeep factory codes
that transmission TCM is in limphome mode.
by light you meant CEL, check engine Lamp that is its name
and comes on for smog fail and other things, (gross errors DRIVE LINE all)
p0700 means (TCM has errors stored, only)
p0100?? that must be a wrong code, written down. says export only.
143 = O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
the oxy sensor B1S3 reads, 0volts all the time, so is bad.
did you replace S3 or the wrong sensor.
on calif 4L it has a split exh, man with 3 sensors, is that your engine? if yes, its the extereme rear o2, (smog only sensor)
S3 is CAT check sensors.

XJ jeeps
we have 2 engines, only in USA< (EPA regs)
2.5L and 4.0L GAS only.
and rule 2, is the transmissions match engines, power. rating!
so there is no one transmission fits all engines.
I owned a 99XJ so know it well.
the export car had a 2.5L diesel , a total different setup end to end.
i have the USA service manual open
there is no p0100 code on any Gas engine , usa.
type or is this DIESEL, post?> why not post engine and fuel first.
that tells me drive line (a/t)

lets change your post
HOW TO GET MY TRANSMISSION (UNSTATED) OUT OF LIMP-IN MODE.?
A: GET IT SERVICED
b: scan it with a real scan tool, not a toy reader.

here are the jeep works on P0700
This SBEC III or JTEC DTC indicates that the EATX or
Aisin controller has an active fault and has illuminated the
MIL via a CCD (EATX) or SCI (Aisin) message. The
specific fault must be acquired from the EATX via CCD or
from the Aisin via ISO-9141.

takes a matching scan tool to scan this box
ISO-9141. is such a tool, spec.
and needs to read P17xx codes (jeeps) too, or you fail.

our 2.5L gas uses the 30RL trans.
the 4.0L gas (petrol) use the AW4 ,tranny "aisin warner box" with TCM brain
what the diesel uses, is not in my book (USA SM)

now my recommendation
drive to any shop
ask for the transmission to be scanned
do not pull your battery cable.
do not push reset. on your cheap or tool old tool.
leave the codes stored in the TCM so the man can scan it
and win.
oddly my jeep book does not explain, oxy sensor 1/3 at all. just that it reads 0v all the time 143 code, odd that.
but no engine or trans stated by you or country