There is a button on the left side of the gear shift shaft, just underneath the shift handle (automatic transmission). Push the button to toggle the overdrive on and off.
Counter clock wise to loosen.
The turn signal relay for the 1995 Pontiac Grand Am is mounted above the fuse block. Look under the dashboard on the driver's side.
The overdrive off light flashing - indicates a malfunction has been detected
There is a push button on the end of your automatic shift lever. Pushing it in causes the Overdrive to turn on and off.
There should be a button on the side of the shifter. Push that button to turn the OD back on.
You may want to check the battery or alternator or both. If you can get to Advance Autoparts they can check this for you for free.
If the overdrive switch is turned off then the car will not go into overdrive. As it is not in overdrive, then it will not downshift out of overdrive as it normally would. It also will not shift to 3rd gear above a certain factory preset speed. Turn th overdrive on and see if it operates normally.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
unbolt lens, remove bulb socket quarter turn
Either under the dashboard on the driver's side or in the engine compartment.
Check the answer to "where is the turn signal on a 1996 Pontiac grand prix?" If your looking for the hazard flasher it's mounted closer to the front and it's easier to access.
take the light off and put the other one in you jack@$$