P0430 (generic)
Catalyst System Efficiency Below Threshold (Bank 2)
System: Powertrain · Catalyst System
Severity: moderate · Inspection: often fails
Description
Same as P0420 but on Bank 2. Replace the Bank-2 catalytic converter after verifying with downstream sensor.
Diagnostic snapshot P0430
- Difficulty
- 6/10 — Intermediate diagnostics
- Est. repair cost
- $120 – $450 (parts + typical shop labor)
Diagnostic workflow
- Confirm P0430 with a live scan — note pending vs stored and freeze frame data.
- Inspect wiring/connectors and related sensors before replacing modules.
- Clear codes and road-test; re-scan after two drive cycles if the monitor must set.
Topics
- OBD-II and scan tools (guide)
- Powertrain DTCs (P-prefix) (system)
Related symptoms
None linked yet.
Common fixes (curated)
None linked yet.
Related articles
- P0430 1998 Toyota 4Runner: Catalyst System Efficiency Below Threshold
- P0430 1999 Toyota 4Runner: Catalyst System Efficiency Below Threshold
- P0430 1996 Toyota Avalon: Catalyst System Efficiency Below Threshold
- P0430 1996 Toyota Camry: Catalyst System Efficiency Below Threshold
- P0430 1996 Toyota Land Cruiser: Catalyst System Efficiency Below Threshold
- P0430 1996 Toyota Supra: Catalyst System Efficiency Below Threshold
- P0430 1996 Toyota T100: Catalyst System Efficiency Below Threshold
- P0430 1996 Toyota Tercel: Catalyst System Efficiency Below Threshold
- P0430 1996 Toyota Tundra: Catalyst System Efficiency Below Threshold
- P0430 1996 Toyota Corolla: Catalyst Efficiency Below Threshold
- P0430 1996 Toyota 4Runner: Catalyst Efficiency Diagnosis
- P0430 1996 Toyota Celica Diagnostic Guide
- P0430 1996 Toyota Paseo: Catalyst Efficiency Diagnosis
- P0430 1996 Toyota Previa: Catalyst Efficiency Diagnostic Guide
- P0430 1996 Toyota Rav4: Catalyst Efficiency Diagnostic Guide
- P0430 1996 Toyota Sienna: Catalyst System Efficiency Guide
Diagnostic bundle (JSON)
Machine-readable graph: related codes, symptoms, fixes, topics, articles, and curated sources rows. Append &external=1 for optional YouTube / Google CSE hits when API keys are configured (see web/.env.example).