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Is your Kia losing power on acceleration, stalling, or giving off a strong "rotten egg" smell? You might be dealing with a failing catalytic converter. This vital exhaust component is crucial for filtering toxic engine emissions. When it becomes clogged or damaged, your vehicle’s performance and fuel economy plummet. Learn the 5 most common warning signs of a bad catalytic converter—including the dreaded P0420 code—and find out exactly what steps you need to take to protect your engine.