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Spark plug question for 1999 996

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

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Discussion summary

YOUR RESEARCHSpark plug question for 1999 996

Leading reported evidence

Replace on earlier 996s

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
The 30k mile maintenance guide states that plugs must be replaced on earlier 996s.
Original post Read captured discussion
Spark plug question for 1999 996

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Leading evidence: 'Replace on earlier 996s' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace on earlier 996s' (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 · 2 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Replace until 60k miles

Performed · outcome unconfirmed

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
For later cars, plugs don't need to be replaced until 60k miles.
Original post Read captured discussion
Spark plug question for 1999 996

Replace plugs

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
Just finished changing the plugs on my wife's 1999 996.
Original post Read captured discussion
Spark plug question for 1999 996

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.

Replace on earlier 996s

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
The 30k mile maintenance guide states that plugs must be replaced on earlier 996s.
Original post Read captured discussion
Spark plug question for 1999 996

Replace plugs

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
Just finished changing the plugs on my wife's 1999 996.
Original post Read captured discussion
Spark plug question for 1999 996

Replace until 60k miles

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
For later cars, plugs don't need to be replaced until 60k miles.
Original post Read captured discussion
Spark plug question for 1999 996

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.

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: 20261026T155324Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Just finished changing the plugs on my wife's 1999 996. A complete PITA when I first started, but pretty easy by the time I finished. Took a little twisting, turning and serpentine routing of hands, tools and plugs to get it all done, but done nonetheless - thanks to Loren's DIY guide at renntech.org. Anyway, here's my question. The 30k mile maintenance guide states that plugs must be replaced on earlier 996s. For later cars, plugs don't need to be replaced until 60k miles. Is this solely because of a change in plugs? Do I need to change the plugs AGAIN at 60k miles, or am I now good until **90K miles**?!? The plugs I removed are Bosch Super R5 871 "FGR6KQC", and I replaced them with Porsche part #999 170 207 91, with "1 Zundkerze" on the box. The plug is a Beru Ultra R6 319, with 0.7 14FGR-6KQU stamped on the metal. Any ideas? Thanks! vty, --Dennis

POST 2Original post

just make sure they are the ones that Loren said are the revised ones that are less prone to fouling and a different cold number- I think you did that just fine. As for replacing again at 30k that's up to you I would.

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