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engine error code po430

lou1

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hoppers crossing
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ve s2 sv6
hi guys my 2010 sv6 has a error code of po430 a quick search states that its catalyst efficiency below threshold. a few months back i did get po420 code which seems to be the same . after a service it disappeared and the mechanic said its more likley the o2 sensor. is this correct?
 

MSBHVN

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Hey mate,
mine came up with something similar about two months ago. Sent it to Holden and they told me it was common for the exhaust gaskets prior to the cat converters to leak and throw the sensors readings off... hence the po430 code. Replaced exhaust gaskets and hasnt presented a problem since.
 

sjroost

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Feb 23, 2013
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dapto
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2009 VE Commadore Omega
Hi MSBHVN, how much did it cost for holden to replace the exhaust gaskets? my holden has had the check engine sign, the 02 sensors have all been replaced and it still kept coming up. did your car do this? does the warning keep coming up now since you replaced the gaskets?thank you
 
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