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If the catalytic converter in a VW Atlas is malfunctioning, it can lead to various problems. One of the most noticeable signs is the presence of black smoke emanating from beneath the vehicle's hood. While not indicating a fire, it is advisable to promptly switch off the car. Additionally, when attempting to accelerate, you may observe that the engine is sluggish and unresponsive, resulting in a reduced maximum speed compared to normal. Furthermore, a sulfur or rotten egg odor may arise from beneath the vehicle. Repairing a catalytic converter typically costs between $950 and $2500, encompassing both parts and labor expenses. Despite being a costly fix, it is essential to address this issue promptly.
The decrease in fuel efficiency and the activation of the service engine light indicate issues with the catalytic converter in the 2018 Volkswagen Atlas.