P0430: Catalyst System Efficiency Below Threshold (Bank 2)
34 vehicles · 16 makes
P0430 is an OBD-II diagnostic trouble code meaning “Catalyst System Efficiency Below Threshold (Bank 2).” Same as P0420 but for the Bank 2 catalytic converter. When both P0420 and P0430 appear, the upstream cause is typically shared. This code appears across 34 vehicle models from 16 manufacturers.
Common Causes
Diagnostic Tools
To diagnose P0430, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (34)
N63 Twin-Turbo V8 Excessive Oil Consumption
N63 Hot-Vee Engine Excessive Oil Consumption
N63 Valve Stem Seal Degradation and Oil Burning
N63/S63 Twin-Turbo V8 Excessive Oil Consumption
N63 Valve Stem Seal Degradation and Oil Burning
Exhaust Manifold Bolt Failure and Leak
Catalytic Converter Theft Vulnerability
Catalytic Converter Premature Failure (Bank 1)
Exhaust Manifold Cracking
Premature Catalytic Converter Failure
Exhaust Manifold Cracking (Both Banks)
Premature Catalytic Converter Failure
Exhaust Manifold Cracking and Bolt Failure
Exhaust Manifold Cracking (4.7L 2UZ-FE V8)
Pre-Catalytic Converter Disintegration (Spyder)
Cracked Exhaust Manifolds on 4.7L V8 Causing Ticking Noise and Exhaust Leaks
Pre-Catalytic Converter Disintegration
FAQ
What does P0430 mean?
P0430 stands for "Catalyst System Efficiency Below Threshold (Bank 2)." Same as P0420 but for the Bank 2 catalytic converter. When both P0420 and P0430 appear, the upstream cause is typically shared.
What are the most common causes of P0430?
The most common causes of P0430 are: Worn catalytic converter Bank 2, Faulty downstream O2 sensor, Exhaust leak, Misfires damaging catalyst, Rich running condition. The specific cause varies by vehicle.
How much does it cost to fix P0430?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0430?
Au7o has documented P0430 across 34 vehicle models from 16 manufacturers: BMW, Chevrolet, Chrysler, Dodge, Ford, Honda, Jeep, Kia, MINI, Mazda, Mercedes-Benz, Nissan, Porsche, RAM, Toyota, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.