All codes › P0430
P0430: Catalyst System Efficiency Below Threshold (Bank 2)
What it means
The bank 2 catalytic converter efficiency is below threshold (V-engines).
Severity: Medium Bank 2 converter efficiency low; emissions failure likely.
Common causes
- Worn bank 2 converter
- Faulty bank 2 downstream O2 sensor
- Exhaust leak
- Prior misfire damage
Most common causes first. Exact causes vary by make, model and engine.
Can I fix it myself?
Rarely DIY. Same approach as P0420 on the other bank.
Repair cost
SEEDED ESTIMATE Roughly $570–$1460
Most likely repair: catalytic converter. Diagnosis fees, taxes and other causes are not included.
| Line | Low | High | Basis |
|---|---|---|---|
| Catalytic converter | $468 | $1063 | Typical listed retail range, source |
| Labor 1–2.5 hr | $100 | $400 | $100–$160/hr, shop survey |
⚠️ This is an editorial placeholder range for this type of repair. It is not based on real invoices or licensed pricing data yet. Real ranges will appear here once enough reader invoices for P0430 are verified.
Verified reader invoices for P0430: 0. Share your repair bill to help build real costs.
Tools that can read P0430
- ScanFixAI: Pro $29.99/mo or $249.99/yr
- OBDAI: Annual PRO bundle $299
- BlueDriver Pro Next-Gen: $119.95 list ($99.95 sale seen)
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