P0430? What to do?

[blue62]

Staircasesurfer

Here are two youtube video's to watch

https://youtu.be/RAC0E6apXq0
https://youtu.be/vyVnhCIMDnw

One shows how an exhaust leak can be the cause of the code.
Also a proper diagnostic procedure to correct the issue.

The other video shows that it was a Cat issue also using a proper diagnostic procedure.

Look closely at the O2 signal graphs in both video's.

The video by ScannerDanner shows the pre and post cat O2 sensors paralleling each other in frequency and amplitude. This is what JFP is referring to in his post.
But the test has to be done under the proper conditions as ScannerDanner has done.

The other video shows the post cat O2 sensor signal rising and falling with the pre cat O2 signal but not with the same frequency and amplitude. The signal is more biased to the lean side.
This is a signal you could also get if the cat was not hot enough.
Here again the test has to be done under the proper conditions for the test to be meaningful.

Hope they give you some insight into fixing your PO430 issue.

[staircasesurfer]

Originally Posted by blue62

Staircasesurfer

Hope they give you some insight into fixing your PO430 issue.

Blue62,

Thank you for the information, this is super helpful. I will take a look at exhaust for leaks, check the cat to ensure it has not separated, swap O2 post cat from bank 1 to bank 2 and run these tests this weekend. I guess if worse comes to worst I can hopefully source a low mileage used header online. CA smog BAR is such trash.

I will make a weekend of it as I currently am in the middle of window regulator replacements, a cut and buff on the paint, interior carpet dye for the rear storage box and maybe opening up the dash to fix the lovely HVAC foam flaps.

Battery died from not driving enough, upon replacement I can't get the catalytic monitoring efficiency readiness to clear. Have not got the CEL since, took a screenshot of the CEL back when I was commuting 70 miles a day.

Was planning on selling the car a few months ago as my Covid work commute is now about 20 feet. Bed, desk, fridge, desk, shi*ter, desk, fridge, bed, routine.

Last weekend I did plugs & tubes (thank you 986 forum for the boat transom plug recommendation), oil and filters. Took it up local hwy 33 with my girl and we both agreed it's not going anywhere. Always helps to have the lady agree .

I have owned the car for 3 years and everyone said don't buy a used Porsche its a money pit and it will live in the shop. Not my experience at all. Between all the knowledge on this forum and a pretty basic set of tools it has not needed to go to the shop once. One of the most reliable cars I have ever owned, (and that list includes a 90's Toyota Pickup). Bar none the most fun, although my 1972 Skylark was pretty fun as a first car. Can't replace the bench front seat memories from back in high school .

I will keep the post updated with my findings as it may help others track down the P0430 issue.