I'm not sure if 20 minutes is enough. Whenever I have to disconnect the battery for that reason I try and do at least 30 minutes - 1 hr just to be sure.

Please let us know what the fix turns out to be.

I have a feeling you're going to end up replacing the wheel sensor. If the lights were not on immediately after re-assembly, then that's my guess.

You didn't mess with the steering angle sensor so what else could it be? At least that's my thought.

Not sure about the mutiple errors causing the problem. If you had a bad wheel sensor, it would read the error multiple times - like now. So, that would mean anyone who replaced a wheel sensor probably had to have the error deleted/reset. If they didn't need errors being cleared, then you have a bad wheel sensor that just needs to be replaced.

I have not replaced a wheel sensor so maybe someone who has can chime in.

All the times I've had those trifecta lights I could reset the steering angle sensor by doing the steering lock-to-lock. I haven't had to use the GT1 or go to the dealer to have it cleared because it was triggered by multiple times.

Please keep us up to date and sorry if I steered you in the wrong direction (no pun intended).