Acura MDX check engine light due to catalyst system efficiency below threshold on Acura MDX

Some Acura MDX owners report experiencing issues related to the check engine light being triggered due to catalyst system efficiency below threshold, which typically indicates a problem with the catalytic converter or emissions system components. Common symptoms reported include decreased fuel efficiency, reduced engine performance, rough idling, stalling, and a strong smell of sulfur from the exhaust. These owners may also notice increased exhaust emissions. The check engine light signals that Diagnostic Trouble Codes (DTCs) are stored in the vehicle's system, which can help identify the specific issue. Potential causes often include a failing catalytic converter, faulty oxygen sensors, or exhaust leaks, with the specific bank indicated in the DTC pointing to which side of the engine is affected. To address these issues, it is crucial for owners to accurately diagnose the root cause, which may involve inspecting the catalytic converter, oxygen sensors, and exhaust system. Consulting a qualified mechanic is recommended for effective identification and resolution of the underlying problem.