7 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHerror codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Reported or suspected cause
air oil separator
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
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 report identifying 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.
Reported cause
My 02 set the CEL and logged some error codes -- I do not recall what they were but they had me thinking "MAF" since they were related to air/fuel mixture issues -- and the problem turned out to be a bad AOS.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Frequently discussed work
Check oil filler tube cap
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
If you want before you do the above let the warm to hot (operating hot) engine idle and with the rear trunk lid open check the oil filler tube cap to see if you can move it and if you can hear any air leak noise.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Read full discussion summary
Leading evidence: 'air oil separator' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'air oil separator' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check oil filler tube cap' (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.
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 report identifying 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.
Reported cause
The error codes came back and it turned out to be a leaking oil filler tube cap.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Disconnect but the original error codes are back
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
You have to read the codes -- do not erase/clear the codes though -- and verify from the codes the CEL is not on due to just the MAF being disconnected but the original error codes are back.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Check oil filler tube cap
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
If you want before you do the above let the warm to hot (operating hot) engine idle and with the rear trunk lid open check the oil filler tube cap to see if you can move it and if you can hear any air leak noise.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Disconnect but the error code could be directly related
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
Be aware the CEL may come on with the MAF disconnected but the error code could be directly related to the MAF being disconnected.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Frequently discussed actions (8)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check oil filler tube cap
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
If you want before you do the above let the warm to hot (operating hot) engine idle and with the rear trunk lid open check the oil filler tube cap to see if you can move it and if you can hear any air leak noise.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Disconnect but the original error codes are back
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
You have to read the codes -- do not erase/clear the codes though -- and verify from the codes the CEL is not on due to just the MAF being disconnected but the original error codes are back.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Replace mass air flow sensor
No successful repair reported for this finding.
0
Reported fixes
1
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report an unsuccessful attempt
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.
Unsuccessful attempt
Another time, prior to the above, something similar happened regarding the CEL and error codes and I ended up replacing the MAF. The error codes came back and it turned out to be a leaking oil filler tube cap.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
Reported and suspected causes (2)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
air oil separator
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying 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.
Reported cause
My 02 set the CEL and logged some error codes -- I do not recall what they were but they had me thinking "MAF" since they were related to air/fuel mixture issues -- and the problem turned out to be a bad AOS.
error codes important or not ? - Page 1 - Boxster/Cayman - PistonHeads UK
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261026T124918Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi - I currently have two error codes on my 2001 Boxster and wanted to know in simple terms what they mean and is it necessary to have the car "fixed" - also if anyone knows what the "fix" procedure is.
the codes are P1128 Oxygen sensing adaptation area (cylinders 1-3)rich
P1130 Oxygen sensing adaptation area (cylinders 4-6)rich
Thanks for any help
As above, likely to be the Mass Air Flow sensor.
You need to get it into your local indy to get it hooked up to some diagnostic equipment to confirm and have the error faults cleared.
NickUSA said:
Or likewise contaminated if running an oiled filter.
That's likely an internet myth - it's never happened in about 6 years of my 996 running a K&N, never had the MAF replaced in that time either. Fitted by Sports & Classic and serviced by them every year.
thegoose said:
NickUSA said:
Or likewise contaminated if running an oiled filter.
That's likely an internet myth - it's never happened in about 6 years of my 996 running a K&N, never had the MAF replaced in that time either. Fitted by Sports & Classic and serviced by them every year.
It is over-oiling which causes the problem. S&C obviously know the right way to do it.
Are there any other engine symptoms? How's the idle speed? Steady? Any stumble/hesitation moving from a stop? Are the oil level and coolant levels ok?
My 02 set the CEL and logged some error codes -- I do not recall what they were but they had me thinking "MAF" since they were related to air/fuel mixture issues -- and the problem turned out to be a bad AOS. (The first AOS failed at around 80K miles, the second around 100K miles later.)
Another time, prior to the above, something similar happened regarding the CEL and error codes and I ended up replacing the MAF. The error codes came back and it turned out to be a leaking oil filler tube cap. The MAF I replaced was just fine. I left the new MAF in service and after around 100K miles when it finally failed -- I forget the error codes/symptoms -- I replaced it with the original MAF that I had stashed in a box. The original MAF worked just fine and continues to work just fine.
For some adventurous owners they'll carefully disconnect the MAF from the electrical harness, use an OBD2 scan tool to clear any error codes. This among other things resets the fuel trims and other learned data to their defaults.
Then the owner just drives the car around normally. If the codes come back chances are it is not the MAF but something else. Be aware the CEL may come on with the MAF disconnected but the error code could be directly related to the MAF being disconnected. You have to read the codes -- do not erase/clear the codes though -- and verify from the codes the CEL is not on due to just the MAF being disconnected but the original error codes are back.
Be aware that if at any time the engine starts to act up in any way you should shut off the engine as soon as it is safe to do so and do not run it again. Let an experience/qualified tech do the diagnosing.
If after say a 30 mile drive if the CEL remains off or at least the same error codes do not show up carefully reconnect the MAF and clear the codes again and drive the car again to see if the codes come back. If they do... the odds are high it is the MAF.
If you want before you do the above let the warm to hot (operating hot) engine idle and with the rear trunk lid open check the oil filler tube cap to see if you can move it and if you can hear any air leak noise. If the cap is original I'd just replace it but that's me.
With the engine idling carefully unscrew the oil filler tube cap and remove it. If you have difficulty removing the cap -- I mean real difficulty -- this can be a sign the AOS is failing. However, without other engine symptoms even if the AOS is going bad it is probably not bad enough to subject the engine crankcase to enough low pressure to make it difficult to remove the cap.
This is a source reference. Confirm exact model applicability in the original material.
