My code reader will show rpm and throttle % in digital reading. At idle, it varies at about 968 I believe and 12% throttle. Is this normal for idle? Anyone know the specs? I have a code for incorrect ratio, P722 I believe is the code. and output speed sensor circuit malfunction- my main problem I THINK. Which is I believe P720 or 721, and a cat converter code which has been on for weeks. Anyhow, is my idle correct, or wrong, and if wrong, will the output speed sensor fix it? TIA.

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Idle looks correct

Change that speed sensor thats why the tranny is in limp mode, that is the most common problem with our trannies, and your lucky you know about cars cause most would have taken it to a shop and they would have probably said "oh your tranny is busted it will be at least 1500 bucks to fix"

but since you are smart its gonna only cost you 30 bucks or so, plus your time to change out the sensor, it might have even just fallen off the holder

1998 dodge avenger 4 cyl AT
Mods are:
Not enough