If your D4 button is blinking along with your speedometer not working then it might be your VSS (vehicle speed sensor) that is out. You can get another one from the junk yard fairly cheap however this is a common problem so I would highly suggest you purchase a new one to avoid buying one that is also bad. Plus you should get a warranty on it if its new so that's a win win. Hope that helped a bit.
You will need to change the brake light switch. The brake light switch can be found below the dashboard on the drivers side.
it is under the front passeneger carpet it is white. I recommend going to pep boys and buuy a chiltons manual and it is quite informative. My son is learning to fix his 91 legend with this book. Good luck
You can fix the speedometer in your 1994 Oldsmobile 98 by replacing the speedometer cable. If changing the speedometer cable does not fix your speedometer you will need to replace the entire speedometer.
Replace bulbs Check the fuse Check the stop light switch
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check the door switch
I've bee told that the 1991 model doesn't have a cable it works off the speed sensor.
If the speedometer doesn't work at all then there could be two causes. The first thing is to check the needle it may be loose on the spindle, secondly there is a relay from the fuse box to the speedometer.
The Main Relay on a legend in under the dash board. Alittle hard to get to and a quick fix at a acura dealership. If your having starting issues, it's your problem.
read the code on the obd ,its more than likely the speed sensor,,,,thats gone out
The best way is to buy a book on your model and see if you can do it. Then! Ask again on this sight for help when you feel confident that you know what your doing to repair the speedometer.
how to fix speedometer for Toyota mr2