Check engine light?

i have a 2002 focus se

check engine light came on today.

what all can cause the light to come on?

i highly doubt it’s anything serious.

the car only has 66,000 miles on it…

Only way of knowing is to get the codes posted here. Go to AutoZone and get them to read the codes. Post them here and some of the fine folks can give you some ideas as to what to look for. Without the codes, any answers are purely speculation.

Well, the guy with a cough is also sure that he doesn’t have lung cancer, but the only way to know for sure is for him to visit a doctor-- and in your case, the only way to know for sure is to have the codes read (free-of-charge) at an auto parts store.

More than likely, it is not something very serious, but until you have the codes read, you should not assume anything.

That CEL (check engine light) is just a kid in class waving her hand trying to get you attention because she has the answer. You need to have the codes read. Some places will read them for FREE. Try Autozone or Advanced Auto Parts. Get the exact code (like P0123) not just their translation into English and post it back here. 

Regarding warning lights:

  1. if the coolant temp light comes on, shut off the engine ASAP

  2. if the oil warning light comes on, shut off the engine ASAP

  3. if a FLASHING MIL/CEL comes on, shut off the engine ASAP

    ASAP means driving to the berm of the highway right now and not waiting for the next exit.

But if the MIL/CEL is not flashing, then it’s not an urgent indicator.