6 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHP 1128, 1130, 1115 1119 Help! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reported or suspected cause
wiring problem
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
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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 suspect a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause
Most likely issue is a wiring problem that has taken out the heaters on the O2 sensors, so I would start there first.
P 1128, 1130, 1115 1119 Help! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'wiring problem' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'wiring problem' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Disconnect maf and drove' (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 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
I tried disconnecting the MAF and drove to see if I noticed a difference, witch I did not.
P 1128, 1130, 1115 1119 Help! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reset /
Suggestion or failed attempt
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 contain suggestions
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Suggestion · Original poster
Does anyone have input on the MAF reset / testing the MAF?
P 1128, 1130, 1115 1119 Help! - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test mass air flow sensor
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 · Original poster
Does anyone have input on the MAF reset / testing the MAF?
P 1128, 1130, 1115 1119 Help! - 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: 20261027T011819Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Ok,
As in the title I have a 2000 Boxster 2.7 and I'm getting the following codes:
P 1128, 1130, 1115 1119
The car seems to idle a little low. somewhere about 650-700 maybe, the car has a light vibration at idle, nothing major. When I drive the car is a little rough right on throttle tip in but the car revs fine and drives nicely.
I've searched and seen a variety of causes and solutions proposed.
I tried disconnecting the MAF and drove to see if I noticed a difference, witch I did not. however, I didn't clear the codes first so I'm not sure if I should have or not.
The car had previously sat for a while before I got it, is it possible there is a fuel pressure issue?
By the way, I tried removing the oil cap, there was a slight vacuum, but it was easy to remove, the idle did increase when I removed it.'
Any help would be appreciated
P1115 and 1119 indicate a problem with the heaters on the O2 sensors ahead of the main cat on both banks. P1128 and 1130 indicate both banks are over rich. Most likely issue is a wiring problem that has taken out the heaters on the O2 sensors, so I would start there first.
This is a common problem with internet discussions of P1128 and 1130. On the early cars (up to 1999) which had the 5.2.2 DME, P1128 and 1130 were the codes for an overly lean condition. However, on the 2000-2001 cars with the 7.2 DME as well as the later 7.8 DME, the same two codes (P1128 and 1130) were for an over rich condition; exactly the opposite condition.
Again, this one of many examples of why I tell people that use out of date or incomplete bootlegged service manuals to always double check their information; unless you have the complete OBD II diagnostics manual for the 986 series, including the more than 100 supplements covering issues like the above, you could easily end up chasing your tail..............
Would it make sense that both O2 sensors ahead of the cats went bad at the same time? The exhaust certainly doesn't look or smell rich. Would that cause the slightly low idle?
Does anyone have input on the MAF reset / testing the MAF?
Could it be an issue with the fuel pressure regulator?
