2004 Honda Civic Check Engine Light

Also....I think my transmission needs to be serviced..would that cause the light to come on?

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Tell us the mileage. Tell us when the tranny was last serviced, and by whom. Tell us why you're suspicious. Tell us what you found when you did all the under-hood checks (oil, rad, tranny, belts).

'Curly'

The only way to determine what is causing the problem is to read the codes from the computer. It could and probably is serious and could be causing further damage as you drive it. Take it to a good service garage or the dealer and find out what is turning on the light. There are hundreds of codes.

My 2004 turned two weeks ago, just before 30K service. Some switch went bad whch they replaced under warranty. I was initially told it would be $100 just diagnosis before I told them the mileage. You are right. I read there are 85 engine light codes for a 2004.