Unhook both sides of battery and wait 1 minute, this will reset reset the computer to default.
I have a 94 buick century the speedometer doesn't work n it has a hard time shifting from 1st gear to 2nd gear it makes a funky noise. would like to find out what I can do Sounds to me the speed sensor is at fault.
A 2004 Buick does not have a speedometer cable. The speedometer signal comes from electronic sensors.
Check blower motor fuse Check to see if compressor is working
There are a couple of reasons why the window won't go back up on a 1996 Buick Century. The window may be off track or the window motor has stopped working.
The logical problem - would be a broken speedo cable. The speedo & odometer are both run from the same cable.
Try the switch that keeps the kids from opening the back window.
Sounds like a bad cable
You coolant level sensor has stopped working, my 93 olds regency is doing the same thing. You will need to goto the a Buick/GM dealership to get the part, it plugs into the side of the radiator.
the catilatic converters could be stopped up.
Check your fuses before anything else. Easiest and cheapest fix.
search for instrument cluster repair in search engine
The contacts between the speedometer head and the wiring connector need to be cleaned. If that does not work get a used speedometer. It fixed mine.