P0430 on Nissan: Catalyst System Efficiency Below Threshold (Bank 2)
Severity: 2 of 4
Usually drivable for a short time with a steady light and normal running. Plan a diagnosis soon. A flashing light, sulfur smell with power loss, or a red hot converter means park it.
Estimate range covers the repairs listed below; see the cost breakdown. A flashing check engine light, a hot temperature gauge, or brakes that feel different mean stop driving and get help.
What P0430 usually means on a Nissan
P0430 is common on Nissan and Infiniti V6 engines, where each bank has a converter, sometimes built into the exhaust manifold.
Most likely causes on Nissan vehicles
- Recall or warranty coverage
- Exhaust leak on bank 2
- Bank 2 rear oxygen sensor
- Worn converter
Order reflects cost and likelihood in general; your vehicle may differ. Confirm with testing before buying parts.
Nissan specific tips
- Check NHTSA recalls with your VIN.
- Confirm which side is bank 2 for your engine before buying parts.
Estimated repair cost
This is an estimate, built from typical parts price ranges plus labor hours times an assumed shop rate of $110 to $190 per hour. Actual prices vary by vehicle, region, and shop. Diagnosis fees are often extra.
| Repair | Parts | Labor | Estimate (low / high) |
|---|---|---|---|
| Rear oxygen sensor, bank 2 | $30 to $120 | 0.3 to 1.2 h | $30 + 0.3 × $110 = $63 $120 + 1.2 × $190 = $348 |
| Exhaust leak repair | $15 to $150 | 0.5 to 2.0 h | $15 + 0.5 × $110 = $70 $150 + 2.0 × $190 = $530 |
| Bank 2 catalytic converter (aftermarket) | $250 to $1,400 | 1.0 to 3.0 h | $250 + 1.0 × $110 = $360 $1,400 + 3.0 × $190 = $1,970 |
Costs are generic for this code; parts and labor on some Nissan models may run higher.
Watch a repair video
P0420 How To Diagnose A Bad Catalytic Converter (EricTheCarGuy); same test applies to bank 2. Third-party video, loads from YouTube (privacy-enhanced mode) only when you press play. Procedures vary by vehicle. Search YouTube for “P0430 Nissan fix” videos.
Repair manuals
Step-by-step service manuals for Nissan with torque specs and wiring diagrams:
Haynes manuals for Nissan Chilton manuals
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Check Nissan recalls
Enter your VIN at the NHTSA recall lookup before paying for repairs.
FAQ
Why only bank 2?
Each converter ages separately; one often fails first.
Read the full P0430 guide or more Nissan check engine notes.