"service" light came on my 2001 chev cavalier

what is the problem. service light is for maintenance like oil change and if you did it reset service light

May is your ignition sensor, or need a maintenance mostly is just oil change and ask to reset ur maintenance light on da dash so it won't litgt up again till need maintenance.

Someone will need to check for voltage at the dimmer switch and then trace back to the fuse box as needed.

remove upper air intake splash shield.remove the headlight housing retaining bolts and pull the housing assembly out to access the bulbs.rotate bulb holder counterclockwise to remove bulbs.WARNING YOU NEED TO WEAR CLEAN GLOVE TO REPLACE HEADLIGHT BULBS BECAUSE THEY ARE HALOGEN BULBS. IF YOU TOUCH HALOGEN BULBS WITH BARE HANDS. OILS FROM SKIN WILL CAUSE HALOGEN BULBS TO OVERHEAT BLOW OUT SO WEAR CLEAN DRY GLOVES.

depending on how long, the fuel could be bad,, longer times could mean hoses cracked, gaskets brittle and bad, I would do a simple service of things, such as topping off brake , antifreeze,, and changing the oil, check the Power steering fluid ,, and transmission fluid, recharge the battery fully , and give it a try ,, if it starts up,, Great!! just be sure as you begin to use it, that you check under the hoood often,, Look for leaks ,, , if it runs ok and no fluids are leaking from any place,, your good to go,, Just keep up with regular maintenance,, as far as the fuel, Like I said before, thats going to depend on how long it sat! If your talking a couple of months you should be ok, I would add a can ( be sure to add the amount that is required depending on how much fuel is in your gas tank at the time ) of a good fuel additive that also cleans the injectors ( if you have them) if the car sat for more than 6 months I would drop the tank and replace the fuel

follow top radater hose to black housing remove two bolts

99 chev cavalier 2.2 problem: Driving along doing 70kms car just dies the only instrument light that came on was the oil light, radio and everything else still working. Shut it off checked oil, plenty in it. Tried to start it and it just wouldn't grab.

Try this... turn ignition key to "ON" setting without starting engine.
Pump the accelerator pedal three times rapidly. The light should go off.
I have used this on my Chev and GM vehicles after doing an oil change myself and it always works.

Check coolant level to make sure it is reasonably clean (not new) check engine oil the same way...should not be black but new coolant or oil can mean that it was changed to cover up a problem, or that there was a recent repair done. Look in the oil fill hole and see if there is any visible sludge. Check trans fluid (automatic) make sure it does not smell burned. If service records are available, check that regular service has been done, also look for "repeat" repairs like trans service twice in one month etc...indicates a problem, perhaps unresolved. Look underneath for leaks. any leaks are bad (even if you know they may be pretty normal.) Make sure that engine is cold when you get there...People will often run a car that has a hard start cold problem, so you will not know about it. Drive the car. Anything you don't like will annoy you after you buy it. anything that feels "wrong" probably is.
If you can, have a mechanic look it over. And, set aside about 2-3 hundred dollars to have all fluids changed as soon as you buy it (gives you a good baseline for continued maintenance.
Good luck

I have a 2002 Chev Cavalier that had the same exact problem. I replaced the bulb harness (purchased from a chevy dealership for around $5) which was fairly easy to do. I have had zero problems with it since.