90 civic SI with GSR swap done correctly. Car has been runing fine for a long time, just got a code 21 (VTEC Solenoid Valve) CEL came on while car was still warming up in cold weather. Car still runs normally and Check engine hasnt lit up again since i restarted.

Should i worry about this?

 

VTEC probably wont engage if that CEL is thrown...Clean the VTEC solenoid and try again, see if it reappears