Possible causes

– Catalytic converter deterioration or malfunction
– Exhaust system leaks
– Loose front or rear HO2Ss
– Faulty front heater O2 sensor
– O2 sensors harness is open or shorted
– O2 sensors poor electrical connection

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?

If the frequency ratio of front and rear HO2S is higher than threshold value, the PCM determines that a fault exists and the P0430 code is stored.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0430 KIA Description

The catalyst