How do you reset the check engine warning light on a 2004 subaru outback?

Answer 1

There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired. Check Engine light comes on due to a wide range of possible problems. The problems can range from sensor issues (MAF, Oxygen Sensors, Etc.) to a loose gas cap, to condensation, to a loose connector on a sensor, perhaps even a dying battery, a flaky alternator or a faulty battery terminal connection. It is a catch-all problem indicator. If you are lucky, you can simply reset the ECU by disconnecting the battery for a minute, and the Check Engine light may be gone. If the error persists, you need to get the error code (if you do not have a code reader or accesspoint, stop by Autozone or somewhere similar and get them to read it for you) see what the error is, and fix the problem. Simple? Hopefully it's not something more troublesome, bad injector, etc.