What might cause my 2009 Chevy Tahoe check engine light to come on?

The check engine light on a 2009 Chevy Tahoe is often the result of a loose gas cap, bad o2 sensor, or a failed catalytic converter. But what makes a catalytic converter so important You may be wondering. Of all the parts that make up a car, the catalytic converter is definitely one of the most important for a number of reasons. The catalytic converter helps to reduce airborne pollutants that could harm people as well as the environment, turninG90% of harmful emissions into less harmful gasses.If You ever find Yourself needing to replace the converter be warned it's a pricey fix. For most vehicles, the average cost of a catalytic converter repair is between $950 and $2480 including parts and labor.