This indicates a problem with the catalytic converter on Bank 2 of your engine. Bank 2 refers to the side of the engine that doesn't contain cylinder #1 (usually the passenger side). The code means the onboard computer has detected that the catalytic converter on that bank isn't working efficiently enough to meet emissions standards.
Several things can cause this code:
* Failing Catalytic Converter: This is the most common cause. Over time, catalytic converters degrade and lose their ability to convert harmful emissions.
* O2 Sensor Issues: A faulty upstream or downstream O2 sensor (oxygen sensor) on Bank 2 can cause inaccurate readings leading to this code. The sensor might be failing, dirty, or wired incorrectly.
* Exhaust Leaks: Leaks before the catalytic converter can also trigger this code because the unburnt fuel affects the sensor readings.
* Air Intake System Issues: Problems with the air intake system (leaks, mass airflow sensor issues) can lead to a lean or rich air-fuel mixture, affecting the catalytic converter.
* Ignition System Problems: Misfires can reduce catalytic converter efficiency.
Important Note: Simply replacing the catalytic converter without investigating the root cause is a costly mistake. The problem might be a minor and inexpensive fix elsewhere in the exhaust system or ignition system. A proper diagnostic is crucial to determine the true cause before undertaking any repairs. A qualified mechanic should diagnose the issue to prevent wasting money on unnecessary repairs.
