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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
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YOUR RESEARCHDang CEL again... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Clean maf and it came back
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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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.
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Performed · outcome unconfirmed
I just cleaned the MAF and it came back on after less than 100 miles.
Dang CEL again... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Clean maf and it came back' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean maf and it came back' (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 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
The car was running fine, but it ran noticeably better after all the sensors were replaced.
Dang CEL again... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace few thousand miles ago
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No successful repair reported for this finding.
0
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Unsuccessful attempts
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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
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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.
Dang CEL again... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace other 3 a few thousand miles
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
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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
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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.
Performed · outcome unconfirmed
One of mine failed at 64k and I replaced the other 3 a few thousand miles after that when I read here that it's best change them all at once.
Dang CEL again... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run noticeably better
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
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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
The car was running fine, but it ran noticeably better after all the sensors were replaced.
Dang CEL again... - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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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.
12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
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Generation: 20261026T194705Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Ok, a few months ago, while pulling into my office parking garage at a steep incline, my CEL came on. Bought a code reader, and it said the code was P1128. Only one bank. I cleared the code, and it didn't come back for over 500 miles. Thought it was just a fluke.
Then, last week, at the same incline at my work garage, it comes on again. I clear the light again, and then 60 miles later, it comes on again. Just cleared the light again. During all this time, I am not experiencing any strange engine idle or drivability issues. Power seems strong, and car runs great. No smoke at startup from tailpipe or anytime thereafter. Any ideas anyone? Car is at 61k miles and is an 01 Boxster.
Have you replaced any of your O2 sensors? Maybe one's preparing to die on you. One of mine failed at 64k and I replaced the other 3 a few thousand miles after that when I read here that it's best change them all at once. The car was running fine, but it ran noticeably better after all the sensors were replaced.
Also check out this current thread:
http://986forum.com/forums/showthread.php?t=23320
Thx. Nope, I have not replaced the sensors yet. Come to think of it, have not changed the MAF or AOS either. Guess lots of things start to go at this age. Lol. Any way to tell for certain it's the O2 sensor?
"while pulling into my office parking garage at a steep incline" means that a shift of the engine is happening opening a crack in the air intake leading to the P1128.
I can't see the shift affecting the MAF or fuel pressure so, since the air intake leak is the second cause listed under that fault code, ....
Ever looked at or replaced your motor mounts?
Motor mount replaced a few thousand miles ago. I thought the incline had something to do with the fuel pump or clogged injectors, but today when the light came back on, I was on a level surface.
Yep. Did the 60k service already, including plugs, motor mount, and water pump too. Will prob just buy a new MAF since I hear cleaning is only temporary. Thx.
My CEL light has been coming on for over a year now. The OBD II shows P1128. I've gone over 2000 miles without it coming back on (a trip from OR to CA and back). I just cleaned the MAF and it came back on after less than 100 miles. The car seems to run fine and I just clear the code. I guess I'll try replacing the MAF with a new one, if I don't find any other solutions. I have a little over 30,000 miles on the car. No other problems. Only mod is snorkle removal.
The two Porsche dealers in the state are at least 100 miles from me and I have yet to find a local mechanic I trust. Other reliable non-dealer Porsche shops are just as far.
Looking forward to any solutions found to this problem.
2000 Boxster, Arctic Silver/Black
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