911uk

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Original source

2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHCheck Engine light on

Leading reported evidence

Use quality parts

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.

Performed · outcome unconfirmed · Original poster
I thought Porsche used quality parts !
Original post Read captured discussion
Check Engine light on

Frequently discussed work

Test next time i need one

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 · Original poster
There is nothing really wrong with the car, but it won't pass a smog test the next time I need one.
Original post Read captured discussion
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Read full discussion summary

Leading evidence: 'Use quality parts' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'same thing, and is a "flaw"' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Test next time i need one' (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.

Read captured replies

1 matching discussions · 2 captured posts examined · 0 partial discussions

Compare 3 other evidence results

same thing, and is a "flaw"

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that suspect a cause: 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.

Suspected cause · Original poster
After talking with several other Porsche shops about the problem they all agree that it is probably the same thing, and is a "flaw" with the '95-'98 993 engines.
Original post Read captured discussion
Check Engine light on

Test next time i need one

Suggestion or failed attempt

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 · Original poster
There is nothing really wrong with the car, but it won't pass a smog test the next time I need one.
Original post Read captured discussion
Check Engine light on

Use oil

Suggestion or failed attempt

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 · Original poster
It doesn't seem to be using oil which makes me curious as to why this diagnosis seems suspicious.
Original post Read captured discussion
Check Engine light on

Frequently discussed actions (3)

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

Test next time i need one

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 · Original poster
There is nothing really wrong with the car, but it won't pass a smog test the next time I need one.
Original post Read captured discussion
Check Engine light on

Use oil

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 · Original poster
It doesn't seem to be using oil which makes me curious as to why this diagnosis seems suspicious.
Original post Read captured discussion
Check Engine light on

Use quality parts

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
I thought Porsche used quality parts !
Original post Read captured discussion
Check Engine light on

Reported and suspected causes (1)

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

same thing, and is a "flaw"

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that suspect a cause: 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.

Suspected cause · Original poster
After talking with several other Porsche shops about the problem they all agree that it is probably the same thing, and is a "flaw" with the '95-'98 993 engines.
Original post Read captured discussion
Check Engine light on

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.

2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

911uk: 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

POST 1 / ORIGINAL POSTEROriginal post

I recently purchased a '96 993 where I am the 3rd owner. I had a '96 C4 I bought new in '96 and drove for ~20k miles with no problems. After a couple thousand miles the "check engine" light came on in this "new" car at appx. 39k miles. I took it to the shop and it was diagnosed with a "secondary air system" problem. After checking all of the easy things the folks at the garage told me that the only thing they could do was to pull the engine and intake system off to find the problem, which is "most likely" worn valve guides. There is nothing really wrong with the car, but it won't pass a smog test the next time I need one. It doesn't seem to be using oil which makes me curious as to why this diagnosis seems suspicious. After talking with several other Porsche shops about the problem they all agree that it is probably the same thing, and is a "flaw" with the '95-'98 993 engines. Has anyone ever heard of this ? Why does it happen with such low mileage ? I thought Porsche used quality parts ! What else is a "known problem area" for the 993s ? Thanks for any input/advice ! Migration info. Legacy thread was 16700

POST 2Original post

This is a common fault with US spec cars, but is not a problem in UK/Europe, so not too much knowledge on this site. Best source of info for you would be www.rennlist.com Migration info. Legacy thread was 16713

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