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O2 sensor CEL after DE day - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHO2 sensor CEL after DE day - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Run first de track day yesterday - what a blast

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 ran my first DE track day yesterday - what a blast to really see what these cars can do!
Original post Read captured discussion
O2 sensor CEL after DE day - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed work

Replace brake fluid

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
Car ran well during the event (other than cooking the old brake fluid - lesson learned, change the brake fluid before the next DE!)
Original post Read captured discussion
O2 sensor CEL after DE day - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Read full discussion summary

Leading evidence: 'Run first de track day yesterday - what a blast' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace brake fluid' (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 · 6 captured posts examined · 0 partial discussions

Compare 1 other evidence results

Replace brake fluid

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
Car ran well during the event (other than cooking the old brake fluid - lesson learned, change the brake fluid before the next DE!)
Original post Read captured discussion
O2 sensor CEL after DE day - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed actions (2)

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

Replace brake fluid

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
Car ran well during the event (other than cooking the old brake fluid - lesson learned, change the brake fluid before the next DE!)
Original post Read captured discussion
O2 sensor CEL after DE day - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run first de track day yesterday - what a blast

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 ran my first DE track day yesterday - what a blast to really see what these cars can do!
Original post Read captured discussion
O2 sensor CEL after DE day - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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.

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

986Forum: 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: 20261026T174436Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I ran my first DE track day yesterday - what a blast to really see what these cars can do! Car ran well during the event (other than cooking the old brake fluid - lesson learned, change the brake fluid before the next DE!) While driving the 2 hours home, after about 90 minutes of highway driving, I hit stop and go traffic and got a CEL light. I checked the fault codes this morning and they were all O2 sensor issues. I reset them and the codes have not come back (yet). Any ideas of what would cause the CEL in the first place? Thx-

POST 2Original post

Depends upon what codes you observed.

POST 3Original post

I had the same thing happen a couple years ago. I ran it hard on Nürburgring and then flew it home at constantly over 100 mph for 1.5 hours. At the 1st stop sign, a CEL popped for an O2 sensor. Reset it and it stayed off for about a year until my MAF sensor took a poop on me.

POST 4 / ORIGINAL POSTEROriginal post

Codes were: P1602 P1123 - code 27, lean P1125 - code 35, lean P1130 - code 34, lean P1128 - code 26, enrich P1276 - code 22, below low limit P0159 - code 23

POST 5Original post

Quotes source post: 448935

Year and model of the car?

POST 6 / ORIGINAL POSTEROriginal post

1997 boxster with 2.5l tip, w/under drive pulley and low temp thermostat - rest is stock for now.

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