I see a lot of consumers asking about the meaning of the check engine light. All too often, a well meaning business will "read the codes" and advise a consumer to buy an expensive part based on misunderstanding of what turns this light on. The part is installed, and the light still comes on, because the correct diagnostic procedure wasn't followed. If a repair doesn't meet the test requirements, the light will always come back. So before you spend your money, check out this short presentation. It will give you a basic idea of what causes the light to come on, and what you should do about it.
