Severity: Fix within days. Drive with caution and watch for new symptoms.
The catalytic converter on bank 2 is no longer cleaning the exhaust as well as it should — the same fault as P0420, on the other side of a V engine.
Rule out misfires, exhaust leaks, and the downstream oxygen sensor first, then check the bank 2 converter.
Same as P0420: usually safe to drive, but it will fail an emissions test and a clogged converter can choke the engine.
You can drive short distances carefully; watch for worsening symptoms. Same as P0420: usually safe to drive, but it will fail an emissions test and a clogged converter can choke the engine.
The most common causes are: Failing catalytic converter on bank 2; Damaged or slow downstream oxygen sensor; Exhaust leak; Engine misfire that overheated the converter; Oil or coolant contamination. A scan tool and a visual check of the parts above is where a technician starts.
Rule out misfires, exhaust leaks, and the downstream oxygen sensor first, then check the bank 2 converter.
