What should I check for or suspect when check engine light come on?

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Answers:

I have a crack (not a chip) in my windscreen and it's heated. Is it Autoglass job or a ford job?

drive your car to autozone, they will plug in and download the codes, and sell you the part. many times they will show you where it plugs in or do it for you, then the check engine light go out, good auto maintaince is key.

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Old motorhome groups?

year, make, model please. there are numerous things that make that light come on, and depending on your car, different ways to find out. suspect that you need to find out what code is set in the computer first, or your wasting your time. (oh, except if its newer than a 96 make sure your gas cap is tight. thats about the only thing you can check first.)

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DTC Code P0421 Catalytic Converter Problem?

it could mean you need a tune-up, or the check engine light sensor needs to be reset.

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