Catalyst System Efficiency Below Threshold (Bank 1)
Usually no drivability symptoms, CEL on, may fail emissions test, Occasional rotten-egg smell if cat is failing
| Job | Range |
|---|---|
| Downstream O2 sensor replacement (DIY) | $40–$150 |
| Aftermarket catalytic converter (parts+labor) | $250–$600 |
| OEM/direct-fit catalytic converter (parts+labor) | $600–$1400 |
| Exhaust leak repair | $80–$250 |
These percentages are general patterns, not a diagnosis for your specific vehicle. Have a technician scan your car to confirm which component is actually failing.
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