Why Your Car Fails an Emissions Test Even When It Drives Perfectly

The catalytic converter is one of the most important emission control components in your vehicle. It converts harmful gases like carbon monoxide and hydrocarbons into less harmful substances before they exit the exhaust. Over time, the catalyst inside can degrade, get contaminated from oil burn, or fail due to overheating.

A degraded catalytic converter often causes no drivability issues at all. The engine runs fine because the converter is a downstream component. It does not affect power delivery or idle quality in the early stages of failure. But the gases coming out of your tailpipe tell a completely different story during an emissions test.

 

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