I just bought this car yesterday & after i put regular unleaded gas in the check engine light came on...I checked the engine and everything is good the fluids are fine...I cranked it this morning light is still on, what could be the problem

You can't put unleaded into a 1999 vehicle... you must have things confused. Some vehicles prefer high octane gasoline instead of regular. Using the wrong one (containing 10% ethanol can overheat and ruin the inside of some engines) Dual fuel engines can handle the ethanol.

If its running o.k. Than I would bet the check engine light is on because there are codes for system too lean. Burn off the tank of e-85 as soon as you can, than fill with regular unleaded. The light should go out after several drive cycles after everything has gone back to normal or you can swing by ou local parts store and see if they can clear the codes

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

yes it can and when it gets low enough you can put high test gas in it.don`t understand ' did you get fingers tied up typing,or do mean code 39.either way it will run on regular unleaded gas.

Hi!!
At the pump, when it says Regular, it means Regular Unleaded Gasoline, the one that says Super, is Super Unleaded Gasoline, the only difference between the two is the octane rating. Both will work just fine on your vehicle.
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You can use which ever grade of gas you desire or can afford, but the premium will give you little better performance (more horsepower). Regular shouldn't cause engine ping, but if you do run regular and you do get a ping just add a bottle of octane booster to the next fill up.

2001 elantra gets 300 miles per tank of gas regular unleaded
slow to respond when accelerated 105 K original miles recently purchased
no check engine lights most parts look original engine revs up but tranny seems slow to respond?

Regular unleaded. Cars are designed to run on specific types of fuel and the fuel rating has to do with the temperature that the fuel ignites. The timing for saturn sc2's is set to run on unleaded. Premium will get you worse gas mileage, lower horse power, and possibly do damage to the engine by igniting at the wrong point during the cycle of the engine. As it says in the owners manual and on the gas clap, use unleaded.

when you open the gas flap to put gas in it should say "unleaded fuel only" or " premium unleaded fuel only". If it says premium only use premium. If it just says unleaded then you can use normal unleaded gas. But some stations have a lower grade unleaded gas. Use 88 octane or better.

may need a fuel pump

Regular is fine. I have a 626 as well with manual and it says regular.