P0430 Code - 2001 Boxster

[AtlantaBoxster]

I want to thank you all for helping me out on this one. The last thing I did was a simple and less than $7 fix vs. the prescribed dealer price of $1800 for a new cat (even though I found a 400 cell after market for $450 delivered).

After switching the O2 sensors from one side to the other and still getting the same pesky P0430 code, my next step was to clean the MAF sensor.

Very simple process. I had forgoteen to buy the right Torx tool and therefore used a vise grip to remove the two screws. Only cost was some time and the bottle of electronic cleaner I picked up at the local auto parts store.

Have run the car over 300 miles without check engine light coming back on. Went to get emmisions done today and passed!

Perfect and thanks again.

[deptotpr]

I had the same thing. Engine Light diagnosis code # P0430.
I stopped at Mobil for gas twice, and had a three hour drive, and ran it like it was stolen. Light came off. I am going to dump a bottle of techron too, why not!?

"Porsches are meant to be driven not polished"

The shop only sees mine from a back of a tow truck.....

No affiliation, just making my point
S•CAR•GO Racing

[sb01box]

I too have 2001 box and also P0430.
the CEL with this code come up only when the car is driven on a flat road with the cruise control on.
if driven hard, the code does not appear.
I've search this site and concluded that the O2 sensors are getting old and lazy. will replace all four some time in the near future.

[thom4782]

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