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New Owner w/ question re DesignTek

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YOUR RESEARCHNew Owner w/ question re DesignTek

Leading reported evidence

Replace cats

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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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.

Performed · outcome unconfirmed · Original poster
Before I bought my car, it was throwing P0420 (and the tech noted that bank 2 was also "starting to deteriorate") so the PO replaced the cats with DesignTek 200 cats.
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New Owner w/ question re DesignTek

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Leading evidence: 'Replace cats' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace cats' (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.

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1 matching discussions · 5 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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Replace cats

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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.

Performed · outcome unconfirmed · Original poster
Before I bought my car, it was throwing P0420 (and the tech noted that bank 2 was also "starting to deteriorate") so the PO replaced the cats with DesignTek 200 cats.
Original post Read captured discussion
New Owner w/ question re DesignTek

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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.

5 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: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I recently bought an '03 C4S and have really enjoyed the car and reading through this forum - thanks for everyone taking the time to write helpful posts. Before I bought my car, it was throwing P0420 (and the tech noted that bank 2 was also "starting to deteriorate") so the PO replaced the cats with DesignTek 200 cats. Comparing with the pic of the cats on my car, I think these are the ones: http://www.design911.com/Exhaust-Cat...996/prod21336/ . About 7k miles after he replaced them, the car is now throwing P0430. I've cleared the code twice but it keeps popping up. While the PO was European and may have purchased these because the brand is better known in Europe than the US, I'm guessing it is more likely that he bought them because they were a cheap alternative. That said, wouldn't crappy cats last longer than 7k (car isn't tracked)?

POST 2 / ORIGINAL POSTEROriginal post

Meant to attached these to the original post.

POST 3Original post

Bump on behalf of the new guy. Cuda, you've got the equivalent of a doctorate on cats now - any thoughts? A couple of other guys have just bought (and researched) cats that I'm sure could chime in. I may buy a set of cats in the future once I get serious about my loud left exhaust - might be a cat going bad. So I'm interested to see the latest forum wisdom on replacement cats. PS- Thanks for posting the pics Spencer. That always helps. And, nice looking car. Welcome!

POST 4 / ORIGINAL POSTEROriginal post

For anyone stumbling upon this thread in the future, designtek wasn't much help in solving the problem. I bought an O2 spacer from FVD and the CEL is no longer an issue. There are no visible inspections on my smog test (at least ive never seen it done in the 10+ ive done in GA) but that is something others might need to consider.

POST 5Original post

Sorry we weren't much help Spencer. Also thank you for reporting back what you discovered on your own.

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