check the vacuum hoses going to the sensor and solenoid at the right front strut tower
To check the solenoid, remove key, connect the D-check connector (green) under the dash, turn key to on/engine off, and listen and feel for the solenoid working. Put your fingers right on it to feel it clicking off and on
Also, a search indicated a few people on NASIOC with RS-Ts have had the same code with aftermarket management. A couple people have had harness issues at the ECU, under the carpet on the PASSENGER side floor. Wires get punished, rubbed, frayed, under and around the ECU shield and carpet.
..still looking more