D4 light randomly went out. all other "d" (d3, 2, and 1 still work along with N and R and P). suggestions on the problem? could the light just be burnt out?

 

Chances are it's just burnt out. As long as it's shifting fine, don't worry about it.

 

The tiny bulbs can be replaced and are available. However, you have to pull the instrument panel (not difficult) to access and repair. Some simply move the D1 bulb (almost never used) to the D4 position. D4 light has added function of indicating a transmission fault code is present, so its good to have working. Although w/ OBD2, you don't really need this function.

good luck

 

do i need to reset my ECU at all while doing this? (do i just pull the fuse?) i have 210,xxx and it's shifting fine on the original transmission. would the CEL come on if it were a transmission issue?

 

I reread your original post and was slightly confused. If D4 light is going on/off, then replacing bulb or moving D1 bulb is unlikely to fix. If it went off and stayed off, D4 is likely bad and can be fixed w/ replacement.

No need to pull a fuse. Most of dash is cold when keyswitch is OFF in any case.

Yes, w/ OBD2 the trans codes all set Pnnn codes. P0700 is apparently set when any trans code is present.

good luck

 

it's out completely. i'll replace it here within a week or two hopefully.
thanks.