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

thom4782 · 05-25-2015, 01:50 PM

Hi everyone:

I've occasionally seen a P0430 code on my 01S over the last 12 months. I've been trying to make sure its the cats causing the code before I spend the big bucks to replace them.

My understanding is that the after-cat O2 sensor voltages will look flat if the cats are working properly. If the cats are weak or bad, then the after-cat O2 sensor voltages will fluctuate like the pre-cat sensors.

Is this true? Is it is, are there any other conditions other than a weak or failed cat which would cause the rear O2 sensor voltages to fluctuate. Or does fluctuating rear O2 sensor voltages pretty much confirm the problem.

Thanks

05-25-2015, 01:50 PM	#16
thom4782 Registered User Join Date: Sep 2010 Location: Foster City CA Posts: 1,099	Hi everyone: I've occasionally seen a P0430 code on my 01S over the last 12 months. I've been trying to make sure its the cats causing the code before I spend the big bucks to replace them. My understanding is that the after-cat O2 sensor voltages will look flat if the cats are working properly. If the cats are weak or bad, then the after-cat O2 sensor voltages will fluctuate like the pre-cat sensors. Is this true? Is it is, are there any other conditions other than a weak or failed cat which would cause the rear O2 sensor voltages to fluctuate. Or does fluctuating rear O2 sensor voltages pretty much confirm the problem. Thanks