986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - P0430 Code

thstone · 04-20-2011, 07:24 AM

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.

04-20-2011, 07:24 AM	#6
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	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. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor