i posted this in the integra forums but i didnt see these tech forums at the time so here it is.
im getting a code 21 and 23. i found a yellow and red wire unhooked and rehooked it to a sensor on the back of the block.then i got a code 23. then i found another sensor unhooked right above that on. its under the intake and screws into the block. any ideas.
96 gsr engine

 

I shall return let me do some research

 

Code 21 is for the VTEC solenoid and code 23 is for the knock sensor. The one that screws into the block is the knock sensor. Get it hooked up and check the wiring to the solenoid.