21 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCat Converter: Rattle, Code & Cost
Leading reported evidence
Replace both
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Leading evidence: 'Replace both' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace both' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
If any O2 sensor codes are read along with these converter codes replace the indicated sensors then road test the car.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
This can be brought about by running an oil high in phosphorus.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
21 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T200546Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Guys, Five weeks after a soul-crushing 60K major service bill, I heard a little "rattle noise" coming from my exhaust system. Apparently not unheard of for a piece of the cat converter to break loose and rattle around, according to the local shop here. Yesterday, the car threw a code: I suspect it's related.
I called a local indy and was quote $2500 for a new cat converter, plus service. I asked if there is a work around. They said only if I'm willing to live with the car throwing a code every two cycles.
Does that cat sound expensive? Is there a work around, or am I just screwed to the tune of $3K-plus?
That $2500 sounds a bit high.... Not apples to apples but my 02 Boxster's converter runs around $1K. The 996 should not cost much more than that. But get a quote from the dealer.
The techs tell me they have to budget for at least one broken exhaust manifold fastener.
If you like the price and if you want you can buy the converter from the dealer and have an indy shop install it. Probably not the one that quoted you $2500 though...
I had both replaced under CPO. Cats were $1800 apiece plus labor with Porsche picking up the tab. Maybe an opportunity to move to an aftermarket exhaust? BTW-If the cost of the 60K was "soul crushing" you might want to reconsider Porsche ownership.
Mine does the same but appears only to be at startup OR when reaching certain low RPM's and from the left side when viewed from behind. If I lightly "push" the exhaust pipe with my foot, it stops so I gather there is something not holding the pipe tight enough.
Most likely your problem is something more fancy than mine, but thought I'd share anyway.
Thanks guys -- the noise was clear and present during the 60K. They checked to see if there was something loose -- but it's clearly the cat. Pulling the code at 3 this afternoon. 90% sure its the cat.
Our sport cat X-pipe is under $2K and adds a very noticeable bump in power and a better sound as well. We just recently made some updates to the system for even more area under the power curve.
Thanks, Chris. Spoke to one of your guys yesterday afternoon. A buddy just lent me his code reader and we pulled a 430 code so I'll be placing an order with you guys this morning.
P0430 (or P0420 for the other side) is converter performing below efficiency.
If any O2 sensor codes are read along with these converter codes replace the indicated sensors then road test the car.
If no sensor codes the converter is likely shot.
By "shot" the converter has lost the ability to store oxygen.
This can be brought about by running an oil high in phosphorus. Where does this phosphorus come from? Well good old ZDDP, which stands for zinc dithiophosphate. Everyone's favorite anti-wear additive.
"Technically legal" no; but you will pass visual inspection and the emissions test with no issues. A lot of my CA friends run Fabspeed, FVD, and other high flow cats and have no problems when it comes time to get their smog certificate.
We are working on this (will take months), but at the moment we do not have CARB certification. That is not to say they will not pass a SMOG test, as many have successfully done so.
With no emissions testing in Michigan I'm not sure how worried I would be with converter efficiency. Perhaps there is a good flowing temporary not quite enviro friendly solution.
