Applicable Systems
OBD-II
Symptoms
Bank 2 catalytic converter efficiency below threshold; post-cat O2 on bank 2 switching like pre-cat.
Possible Causes
- Bank 2 catalytic converter degraded
- Bank 2 post-cat O2 sensor faulty
- Exhaust leak on bank 2
Troubleshooting Steps
- Step 1: Compare bank 2 pre and post-cat O2 sensors
Post-cat should be steady - Step 2: Check for bank 2 exhaust leaks
No leaks - Step 3: Verify bank 2 O2 sensors operational
Sensors switching normally - Step 4: Replace bank 2 catalytic converter if confirmed degraded
Post-cat O2 steady - Step 5: Clear code and verify with drive cycle
No P0430 return
How to Reset
Clear with OBD-II scanner; requires drive cycle to verify.
Common Replacement Parts
- Catalytic Converter Bank 2 (OEM spec)
Frequently Asked Questions
- Q: Do both cats need replacement?
Only replace the failing bank's cat. But if one cat failed due to age/miles, the other may not be far behind. Consider both if high mileage.
Comments (0)
Share your experience to help others facing the same problem.
Leave a Comment
Source: SAE J2012 standard DTC list + OBD-II portal
Category: OBD-II
No comments yet. Be the first to share your experience!