This means the catalytic converter on Bank 2 (usually the passenger side) isn't working efficiently. There are several reasons why this could be happening:
* Failing Catalytic Converter: This is the most common cause. The catalytic converter is damaged or clogged, preventing proper exhaust gas conversion.
* Oxygen Sensor Issues: A faulty oxygen sensor (O2 sensor) either upstream or downstream of the catalytic converter on Bank 2 can cause this code. A bad sensor provides inaccurate readings to the computer, leading to the code.
* Exhaust Leak: A leak in the exhaust system before the catalytic converter on Bank 2 can also trigger this code. The leak disrupts the exhaust flow and affects the readings of the oxygen sensors.
* Air/Fuel Ratio Issues: Problems with the air/fuel mixture getting to the engine can indirectly impact the catalytic converter's efficiency and set this code. This might involve problems with the mass airflow sensor, fuel injectors, or other related components.
* Wiring or Connector Problems: Damaged wiring or connectors in the oxygen sensor circuit can also lead to incorrect readings and trigger the code.
To diagnose the problem, a mechanic will likely:
* Read the codes: Using a scan tool to retrieve any other related codes.
* Inspect the catalytic converter: Check for physical damage, blockage, or internal breakdown.
* Check the oxygen sensors: Inspect the wiring and connectors, and possibly test the sensors themselves.
* Inspect the exhaust system: Look for leaks between the engine and the catalytic converter.
* Check the air/fuel mixture: Verify the engine is running within the correct air/fuel ratio.
It's important to have this properly diagnosed by a mechanic. Simply replacing the catalytic converter without investigating other potential causes might be a costly mistake if the underlying problem isn't addressed.
