Severity: Fix soon. Usually safe to drive for now.
The catalytic converter on bank 1 is not warming up fast enough after a cold start, so it is not cleaning the exhaust during warm-up.
Check for exhaust leaks and test the downstream oxygen sensor before replacing the converter.
Safe to drive. It affects warm-up emissions, not normal driving.
Generally safe to drive, but get it checked soon. Safe to drive. It affects warm-up emissions, not normal driving.
The most common causes are: Failing catalytic converter; Failing downstream oxygen sensor; Exhaust leak; Engine running too rich on warm-up. A scan tool and a visual check of the parts above is where a technician starts.
Check for exhaust leaks and test the downstream oxygen sensor before replacing the converter.
