Tune up, where to start
You should not operate your car under either of those circumstances. ) If that does not reveal the problem, then your wisest move is to take your car to a repair shop as quickly as you can, even if your car still appears to be running smoothly. Don't ignore that check engine light! Your check engine light can signal serious driveability issues, such as transmission or emissions failures or steering and ride control problems. A certified technician can perform a diagnostic (preferably immediately) to determine what needs to be done to correct the problem before it causes permanent damage to your car. Do not take your car to an auto parts store for diagnostic work.