INFINITI QX56 repeated fuel smell and engine power loss issues with ongoing catalytic converter and O2 sensor failures on INFINITI QX56

Some INFINITI QX56 owners report experiencing issues such as repeated fuel smells and engine power loss, which may be linked to problems with the gas cap, fuel system, or emissions control system. These fuel odors can indicate underlying issues that require attention. Additionally, owners have noted that engine power loss could stem from a failing catalytic converter, potentially triggering the check engine light. Ongoing failures of the catalytic converter can lead to significant emissions problems and performance issues. Some owners have also faced challenges with O2 sensor failures, which can be misdiagnosed, complicating the identification of the actual problem. It is crucial for owners to remain vigilant about timing chain problems and the potential for costly repairs. Regular maintenance, including checking for fuel pump failures that may cause rough idling or stalling, is essential for ensuring peak performance and reliability. If a faulty fuel level sensor is suspected, consulting the vehicle's service manual to locate the sensor within the fuel tank may aid in troubleshooting the issue.