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What Is My Check Engine Problem?

Asked by usaloveorleaveit (163points) October 14th, 2011

I own a 2000 Toyota Tacoma and recently I started getting horrible gas mileage. I went from 19–20 mpg to around 14–15 mpg. My check engine light came on and I read two codes. They are P0401 (EGR Flow Insufficient) and P0303 (Cylinder 3 Misfire). Not sure where to start. Seems like it could be a lot of things. Step by step instructions on how to diagnose and fix would be greatly appreciated. Thanks.

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