Several things can cause this:
* Failing Catalytic Converter: This is the most common cause. Catalytic converters have a limited lifespan and eventually wear out.
* O2 Sensor Issues: A faulty upstream (before the catalytic converter) or downstream (after the converter) oxygen sensor on Bank 1 can cause inaccurate readings, leading to this code. A bad upstream sensor is more likely to cause this.
* Exhaust Leaks: Leaks before the catalytic converter can disrupt the flow of exhaust gases, affecting its efficiency.
* Ignition System Problems: Misfires or other ignition problems can also contribute to the inefficiency of the catalytic converter by sending unburned fuel into the converter.
* Evaporative Emission System (EVAP) Problems: In some cases, issues with the EVAP system can indirectly trigger this code.
Troubleshooting:
Diagnosing the exact cause requires a mechanic to perform several tests including:
* Visual Inspection: Checking for exhaust leaks.
* O2 Sensor Testing: Checking the voltage output of the oxygen sensors.
* Scan Tool Data: Examining live data from the OBD-II scanner to look for clues like fuel trims, misfire counts, and oxygen sensor readings.
* Catalyst System Efficiency Test: More advanced testing might be needed to specifically assess the converter's performance.
Simply clearing the code won't fix the underlying problem. Ignoring it can lead to more serious issues and potentially damage the catalytic converter further. It's best to have a qualified mechanic diagnose and repair the issue.
