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Are these stock cats?

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15 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHAre these stock cats?

Leading reported evidence

Clean )

Suggestion or failed attempt

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 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.

Suggestion

I've done steady state and mixed driving for a couple hundred miles and still not ready for the OBD check part of the emissions test (sniff came back as very clean)

Are these stock cats?
Read full discussion summary

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

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1 matching discussions · 15 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Replace battery

Suggestion or failed attempt

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 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.

Suggestion

You're getting P0420 P0430 O2 Sensors codes after replacing the battery ??

Are these stock cats?

Reset after installing a new battery...any thoughts

Suggestion or failed attempt

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 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.

Suggestion

I'm not able to get the cat sensors to reset after installing a new battery...any thoughts?

Are these stock cats?

Test (sniff came back as very

Suggestion or failed attempt

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 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.

Suggestion

I've done steady state and mixed driving for a couple hundred miles and still not ready for the OBD check part of the emissions test (sniff came back as very clean)

Are these stock cats?

Test shows cats not ready

Suggestion or failed attempt

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 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.

Suggestion

Nope, no codes...OBD test shows cats not ready.

Are these stock cats?
Frequently discussed actions (5)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Clean )

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.

Suggestion

I've done steady state and mixed driving for a couple hundred miles and still not ready for the OBD check part of the emissions test (sniff came back as very clean)

Are these stock cats?

Replace battery

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.

Suggestion

You're getting P0420 P0430 O2 Sensors codes after replacing the battery ??

Are these stock cats?

Reset after installing a new battery...any thoughts

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.

Suggestion

I'm not able to get the cat sensors to reset after installing a new battery...any thoughts?

Are these stock cats?

Test (sniff came back as very

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.

Suggestion

I've done steady state and mixed driving for a couple hundred miles and still not ready for the OBD check part of the emissions test (sniff came back as very clean)

Are these stock cats?

Test shows cats not ready

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.

Suggestion

Nope, no codes...OBD test shows cats not ready.

Are these stock cats?
Coverage and how to read this overview

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.

15 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.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link

I've done steady state and mixed driving for a couple hundred miles and still not ready for the OBD check part of the emissions test (sniff came back as very clean)

Quoted acknowledgement is not verified as the original poster

Generation: 20261026T203514Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I'm considering purchasing a 996 Porsche located out of state. The seller bought the car equipped with a Billy Boat exhaust system, including headers. The seller believes the car retains its original catalytic converters. Given California's strict emissions standards, I'm concerned about the vehicle's smog compliance. While it's challenging to definitively determine the presence of stock catalytic converters from a photo, are there any reliable methods to verify this before purchasing? I�m going to order PPI, but I am afraid that won�t help me determine if these are stock cats.

POST 2Original post

Yes, those look like stock catalytic converters to me.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 19801378

Here I found a pic of what stock should look like. On the one in question the dimples look further apart and the cat shape is different. Do you see what I see?

POST 4Original post

Yes, I see what you see. I have stock cats on my car (as far as I know) and they look like those in the first photo, with the dimples spread apart. Those cats don�t look like the common aftermarket high-flow cats, too (which don�t usually feature a dimple). The difference in dimple distance is probably attributed to manufacturing years. That�s just my assumption, but I can�t think of any other reason why they�d be different.

POST 5 / ORIGINAL POSTEROriginal post

They do more like 996.2 once, which is odd.

POST 6 / ORIGINAL POSTEROriginal post

Quotes source post: 19801402

Are there any numbers stamped on your cats?

POST 7Original post

I don�t think so. I don�t see any large obvious numbers, but never examined them closely enough to see if there are any in small font.

POST 8Original post

There will be part #'s on the cats to identify them...The Inspector will look for them if he suspects they are not Carb Approved...The aftermarkets ones that are CARB Approved will have an Approval tag/number on it.. Those look like original to me...

POST 9Original post

Quotes source post: 19801441

OP - sorry to hijack the thread... I'm not able to get the cat sensors to reset after installing a new battery...any thoughts?

POST 10Original post

Quotes source post: 19802531

You're getting P0420 P0430 O2 Sensors codes after replacing the battery ??

POST 11Original post

Quotes source post: 19802543

Nope, no codes...OBD test shows cats not ready. I've done steady state and mixed driving for a couple hundred miles and still not ready for the OBD check part of the emissions test (sniff came back as very clean)

POST 12Original post

Quotes source post: 19802550

Just needs more driving/idling..... If you had a PIWIS it has a program to force the OBD Readiness Tests to run quickly while still in the shop..........Professional Technicians don't have time/get paid for all the driving at different speeds.....lol

POST 13Original post

Never mind just the cats…you should be asking for a CARB EO # for the headers. Without this you will not pass smog here in Ca.

POST 14Original post

Quotes source post: 19802563

Have a Durametric, but not a PIWIS...guess I'll keep on keeping on!! Thanks Skip.

This is a source reference. Confirm exact model applicability in the original material.