Got a 92 Civic LX with 187000 miles on it.
Today I discovered that my D4 shift light is out in my cluster..I recently changed out all my stock cluster lights for the better look of the blue led lights...I know what size those lights are but does anyone know the size of the D4 cluster light?
It's just that one light..D2,D3,R,N,P are still working.

 

Ummm...just did some research on D4 light being out and no...my transmission has not been slipping..My car drives & shifts when it's suppose to.

 

I think those are #73 bulbs, may need to pull cluster again to check. Once you do that you could just swap it with the D2 bulb that is pretty much never used. If the computer detects a problem with the transmission, the D4 light will flash on and off, it wouldn't just stay out. So most likely the bulb is burnt out.

 

Yeah I just took out my D2 light & stuck it in the D4 slot since I never ever use it.
What is D2 used for anyway..I heard it was used for going downhill..Civics has engine brakes?