take the complete headlight assembly loose or out to get to the bulb.
The oxygen sensor on the 1999 Oldsmobile Cutlass Sierra is located on the lower exhaust. If you need to replace it, they are available for about $20 online.
Replacing a thermostat on a 1999 Oldsmobile Cutlass is very easy to do. First you will find the thermostat by following the upper radiator hose. It is under the exhaust crossover. The thermostat has two 13 mm bolts holding it in place. Take the bolts off to remove the thermostat and replace with a new one.
DEX-COOL
How do you replace a 1999 Ford Escort headlight bulb?"
how do you replace head lights on my 1999 oldsmobile alero?
replace a fuel filter on a 1999 Oldsmobile Silhouette
Remove the wiper arm from your 1999 Oldsmobile Cutlass wiper motor. Remove the wiper motor wiring harness. Remove the wiper motor retaining bolts. Reverse the process to install the new wiper motor.
I'd call a locksmith. They will be able to tell you the exact problem and how to fix it.
lift hood,on top of the headlights are tabs to pull up.pull the tabs up and pull the headlight towards you and it will make the bulb holders visible
The 1999 Oldsmobile Cutlass OBD 2 port is under driver side dash left of steering column
To remove the headlight from a 1999 Oldsmobile Eighty Eight, first, open the hood and locate the headlight assembly. Disconnect the electrical connector by pressing the tab and pulling it out. Next, remove the retaining screws or clips securing the headlight assembly to the vehicle, then gently pull the assembly forward to detach it from the vehicle. Finally, replace the bulb if needed and reinstall the assembly in reverse order.
dextron / mercon type 2