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.

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.

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P0430 Information for specific makes

P0430 INFINITI
P0430 NISSAN
P0430 TOYOTA
P0430 LEXUS
P0430 FORD
P0430 BUICK
P0430 HONDA
P0430 ACURA
P0430 BMW
P0430 CHRYSLER
P0430 DODGE
P0430 JEEP
P0430 HYUNDAI
P0430 KIA
P0430 MAZDA
P0430 MITSUBISHI
P0430 AUDI
P0430 VOLKSWAGEN
P0430 CADILLAC
P0430 CHEVROLET
P0430 GMC
P0430 PONTIAC
P0430 SATURN
P0430 JAGUAR