Nissan Maxima recurring catalytic converter and O2 sensor failures with multiple replacements on Nissan Maxima

Some Nissan Maxima owners report experiencing recurring catalytic converter and O2 sensor failures despite multiple replacements. These issues may stem from faulty oxygen sensors that lead to improper air-fuel mixtures, causing unburned fuel to damage the catalytic converter. Additionally, improper engine combustion due to a deteriorating catalytic converter can result in O2 sensor malfunctions. Misfire issues, such as failing coils or faulty gaskets, are also reported to contribute to these problems. Some owners have identified MAF sensor failures as a factor, with a declining MAF sensor triggering codes related to the catalytic converter and O2 sensors. Furthermore, certain models, like the '01 Maxima, are noted for having design or manufacturing problems that exacerbate these recurring issues. Consulting a professional mechanic experienced with Nissan vehicles is recommended to accurately diagnose and address the root causes of these failures.