ok i just put in a obd0 jdm b16 swap in my 91 civic si and i was running off my pm6 for about a week and didn't get know check engine light. now that i have the obd0 pr3 ecu i'm getting codes 2 and 21 now i didn't hook up vtec yet could that be y i'm getting code 21, for code 2 i don't know what code to is please help thanks

 

Code 2 is for the second 02 sensor.

 

code 21 = vtec solenoid

 

i only have one o2 senser what do i have to do so that the check engine light will go off and will this cause my vtec to cut out some time and i fix code 21 but now i;m getting code 22 so. could that be my vtec oil presure switch or could that code be coming up because of the second o2 senser