Severity: Fix within days. Drive with caution and watch for new symptoms.
The main catalytic converter on bank 1 is working below its efficiency threshold, similar to P0420 but for the primary converter.
Rule out sensor and exhaust problems first, then check the converter.
Safe to drive for now, but it will fail an emissions test. Check the underlying cause before replacing the converter.
You can drive short distances carefully; watch for worsening symptoms. Safe to drive for now, but it will fail an emissions test. Check the underlying cause before replacing the converter.
The most common causes are: Failing catalytic converter; Damaged downstream oxygen sensor; Exhaust leak; Misfire damage. A scan tool and a visual check of the parts above is where a technician starts.
Rule out sensor and exhaust problems first, then check the converter.
