Repair-It

Apparently yes.

https://www.alfaobd.com/

https://www.jeepgarage.org/threads/how- ... 2021253803

Looks like about $60 for the software, and I think they recommend the "multipin" version of this thing for about $240 for PC (I don't have any android stuff):
http://www.obdkey.com/obd_orders.asp?
OBDKey® Multipin Bluetooth

So $300 even.

I wonder if there's some other hardware I could use.

Is that just a j-2534 device? Because my GM MDI clone box may work.

Probably worth a try before you buy it.

No, it is not. It is an ELM327 device.

This MAY be an el cheapo option: https://a.co/d/010neaM1

Better: https://a.co/d/0iKxxe9k

Max $130 investment and could get away at $78.

Still has the unable-to-achieve ride height code, which I think may be due to nitrogen tank overpressurization because of the too-much-mass code I got while filling. Instead of guessing, I just ordered both dongles and will buy the AlfaOBD software when they come in. If the cheap one works, great. If not, I have the more expensive one. I'll figure out what to return when I'm done with this service.

That's a good plan.

The cheaper dongle worked fine once I downloaded driver and figured out it was on com 6 (software auto looked at com3/4). System air mass appears fine (it’s just a calc based on pressures at all 4 corners and the tank). About 202.0 bar-liters, varies slightly depending on balance up to like 206.0.

Seems like it can’t usually hit the target height it wants on the right rear. I wonder if the fill or dump on that is sticky. Seems to move sometimes though.

Tried a whole bunch of cycles of each spring. Seems like the fronts aren’t responding. I wonder if should just get one of these since I’m at 18Xk miles.

https://rebuildmastertech.com/rebuilt-a ... 2011-2021/

It seems like the system typically uses the compressor to return air to the tank, and tank pressure to lift the springs. I wonder if the compressor is weak and I had less air mass in the system which made it easier to push back to the tank. Maybe the compressor is worn after all.

rpaoness wrote: Sun May 03, 2026 7:43 pm Tried a whole bunch of cycles of each spring. Seems like the fronts aren’t responding. I wonder if should just get one of these since I’m at 18Xk miles.

https://rebuildmastertech.com/rebuilt-a ... 2011-2021/

Not a bad idea. Those are the guys who rebuilt my S550 strut.