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Engine light

what causes the engine light to come on?

Same question, different wording. See your other post: http://community.cartalk.com/posts/list/1902009.page

Some light, some not!

Aluminum engine=light

Cast iron engine=heavy

;-))

Seriously, however, it is not necessary to post the same question twice. Refer to your other post for responses.

If you are asking "could I be missing something important if I ignore the “check engine light” the answer is yes.