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Answered 2011-09-13 17:36:18

In most cases the check engine light will come on after you put a new engine in it, it can come on for various reasons, In my case my check engine light came on because my oxygen sensor was reading the fumes from my exhaust in which came from my last engine. eventually iit will turn off but its good to get a diagnostic to be sure that they wouldn't have to replace your sensor

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Is the check engine light "ON" and if so have you had it diagnosed? Did you replace the fuel filter when you replaced the pump?

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The check engine light, on your Hyundai Elantra can be reset by removing the fuse. Keep the fuse out for 10 seconds and replace it to its slot.

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