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P1128 oxygen sensing /vacuum leak or 02 sensor - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHP1128 oxygen sensing /vacuum leak or 02 sensor - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Reported or suspected cause

ects

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause: 1
Suspected cause: 0
Reported fixes

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 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
sorry I should have mentioned I did replaced the MAF sensor few months ago when I was having issues thinking that was the issue turned out to be the ECTS
Original post Read captured discussion
P1128 oxygen sensing /vacuum leak or 02 sensor - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed work

Check aos connections, those are a pain

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
Double check the AOS connections, those are a pain to remove and reconnect.
Original post Read captured discussion
P1128 oxygen sensing /vacuum leak or 02 sensor - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Read full discussion summary

Leading evidence: 'ects' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'ects' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check aos connections, those are a pain' (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 · 3 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Check aos connections, those are a pain

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
Double check the AOS connections, those are a pain to remove and reconnect.
Original post Read captured discussion
P1128 oxygen sensing /vacuum leak or 02 sensor - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace maf sensor few months ago

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
sorry I should have mentioned I did replaced the MAF sensor few months ago when I was having issues thinking that was the issue turned out to be the ECTS
Original post Read captured discussion
P1128 oxygen sensing /vacuum leak or 02 sensor - 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.

Check aos connections, those are a pain

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
Double check the AOS connections, those are a pain to remove and reconnect.
Original post Read captured discussion
P1128 oxygen sensing /vacuum leak or 02 sensor - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace maf sensor few months ago

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
sorry I should have mentioned I did replaced the MAF sensor few months ago when I was having issues thinking that was the issue turned out to be the ECTS
Original post Read captured discussion
P1128 oxygen sensing /vacuum leak or 02 sensor - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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.

ects

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
sorry I should have mentioned I did replaced the MAF sensor few months ago when I was having issues thinking that was the issue turned out to be the ECTS
Original post Read captured discussion
P1128 oxygen sensing /vacuum leak or 02 sensor - 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.

3 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: 20261026T061123Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

hey Guys . so I m dealing with this code a bit of history : after working on the top of the engine looking for Coolant temperature sensor in the wrong place !! mistakenly removing stuff such as intake hoses , intake manifold I know ! seen a video where I thought the sensor was located turns out to be underneath , placed everything back together good and tight I though ! after driving few days getting this code now . so I m thinking I got a vacuum leak .. this morning did a smoke test I can NOT see any smoke except over OUT of the air cleaner box questions is that to be expected smoke out of the air cleaner box ? should I consider the 02 sensors ? what else should I be looking at ?

POST 2Original post

That is a lean alarm code. Double check the AOS connections, those are a pain to remove and reconnect. You need to hear or feel the click when reinstalling.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 654208

hum ! I did replaced the AIR OILSEPARATOR a while back did not have those code till I messed with it looking for the ECTS .. I just swapped back the old MAF sensor (bosh oem ) removed new one i had bought from rockauto .. wondering if that is the issue same BOSH numbers thought !! sorry I should have mentioned I did replaced the MAF sensor few months ago when I was having issues thinking that was the issue turned out to be the ECTS i started it . actually sounds pretty damm good . dont hear any hissing . pulled the codes afterwards NO CODES at all maybe that was the issue ..

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