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Typically, to reset the check engine light in a 2006 Chevy Silverado, you would use an OBD-II Scan Tool. These tools can be bought for around $40 to $50, depending on what features they include. Alternatively, you could go to a local auto shop and have a professional clear the code for you. The OBD-II port is usually located under the dashboard on the driver's side. Another method that has been suggested is to disconnect the battery for 10 to 15 minutes. However, only attempt to clear the warning if you are completely certain there are no ongoing issues or if you have addressed any potential problems. There are various reasons why the light might come on, such as a failing catalytic converter, a loose fuel cap, a MAF sensor detecting an incorrect fuel/air mixture, or a faulty oxygen sensor.
You can clear the check engine light by cycling the ignition on and off three times.
I always carry a code reader with reset function in my truck because my emissions vapor canister keeps triggering a fault code. Whose bright idea was that faulty part?