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P0430 - Catalyst System Efficiency Below Threshold Bank 2

Possible causes
- Three way catalyst converter Bank 2
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM)
Tech notes
As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.
When is the code detected?
- Three way catalytic converter Bank 1 does not operate properly.
- Three way catalyst converter Bank 1 does not have enough oxygen storage capacity.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0430 Description

The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).

A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.

When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.

OBDII Code P0430 - Catalyst System Efficiency Below Threshold Bank 2 - AutoCodes.com
P0430 Information for specific makes
P0430 ACURA Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 AUDI Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 BMW Catalytic Converter Conversion 2  P0430 Image
P0430 BUICK Catalyst System Low Efficiency Bank 2
P0430 CADILLAC Catalyst System Low Efficiency Bank 2
P0430 CHEVROLET Catalyst System Low Efficiency Bank 2
P0430 CHRYSLER Catalyst Efficiency Bank 2  P0430 Image
P0430 DODGE Catalyst Efficiency Bank 2  P0430 Image
P0430 FORD Catalyst System Efficiency Below Threshold Bank 2  P0430 Video  P0430 Image
P0430 GMC Catalyst System Low Efficiency Bank 2
P0430 HONDA Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 HYUNDAI Warm Up Catalyst Efficiency Below Threshold Bank 2  P0430 Image
P0430 INFINITI Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 JAGUAR Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 JEEP Catalyst Efficiency Bank 2  P0430 Image
P0430 KIA Warm Up Catalyst Efficiency Below Threshold Bank 2  P0430 Image
P0430 LEXUS Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 MAZDA Catalyst Efficiency Monitor Malfunction Bank 2  P0430 Image
P0430 MERCEDES-BENZ Catalyst System Efficiency Below Threshold Bank 2
P0430 MITSUBISHI Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 NISSAN Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 PONTIAC Catalyst System Low Efficiency Bank 2
P0430 SATURN Catalyst System Low Efficiency Bank 2
P0430 TOYOTA Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
P0430 VOLKSWAGEN Catalyst System Efficiency Below Threshold Bank 2  P0430 Image
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