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A P0430 code means that the oxygen sensor downstream of the catalytic converter is detecting that the cat is not working properly. This results in higher emissions. Odds are that the car drives fine.
Likely causes are:
Exhaust leak
Intake leak
O2 sensor not working properly (could be either O2 sensor on Bank 2)
MAF (not likely but cheap to clean)
Cat not working properly
Most people start by looking for exhaust and intake leaks and if all seems well there then they replace the O2 sensors. Otherwise work your way down the list, and please note that its rare that the actual cat is bad. Its usually something else.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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