11 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRepeating CEL P1123
Leading reported evidence
Replace maf, cleared the codes, and no problems
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
Replaced the MAF, cleared the codes, and no problems.
Leading evidence: 'Replace maf, cleared the codes, and no problems' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean maf during the 2.5 years' (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.
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1
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Suggestion
I'd clear the code and clean the MAF, but a week later after the same trip the code would be back.
Barn: Clean the MAF with some electronic parts cleaner and also clean your throttle body with some carb cleaner you will be surprised by all the carbon built up in the throttle body.
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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Suggestion
The cleaning may delay the activation of the CE light, but it apparently does not return the maf to proper function, IMO.
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.
Barn: Clean the MAF with some electronic parts cleaner and also clean your throttle body with some carb cleaner you will be surprised by all the carbon built up in the throttle body.
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
Barn: Clean the MAF with some electronic parts cleaner and also clean your throttle body with some carb cleaner you will be surprised by all the carbon built up in the throttle body.
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.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T082735Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Over the weekend I was completing another trip to the mountains in NH, and after exiting the highway I noticed a CEL(non-blinking).Luckily, I carry a code reader with me in my '99 Porsche and it read
P1123(which indicates a lean threshold in cylinders 1-3...oxygen sensing adaptation area 1). This CEL has come on about 4 or 5 times in the last 2 1/2 years of ownership. Can someone tell me what is going on, and whether I should start worrying? .By the way, I reached triple digit speeds a few times for short distances and then saw the CEL after stopping at a light a few minutes later.TIA.
I had this code a while back, and found that there was a leak in the exhaust system. That's only one of many things that could cause it, including a bad O2 sensor.
What have you done before to fix it? Recent services?
'Lean threashold' makes me think that the ECU is trying to pull fuel out of the mixture to the point where it can't any longer. Leaky fuel injector maybe? Bad MAF? Bad plugs? IDK, just brainstorming here.
Thanks everyone. After reading the 3 pages that you referenced redridge, it looks like MAF and the O2 sensors were the culprits for the person with the same error code. I think I'll try that route if I get another CEL code again. Great information from a great forum.
Replace the MAF.
My car started generating P1123 codes after interstate highway blasts followed by stops on exit ramps. I'd clear the code and clean the MAF, but a week later after the same trip the code would be back. And then the P1123 code started being accompanied by a P1125 code.
Replaced the MAF, cleared the codes, and no problems.
I bought mine from Autopartsworld.com but I believe it is available for a lower price from Autohausaz.com. I've done quite a bit of business with both of those vendors and have always been completely satisfied with them.
BTW, you'll notice the car runs much better with the new MAF.
Barn: Clean the MAF with some electronic parts cleaner and also clean your throttle body with some carb cleaner you will be surprised by all the carbon built up in the throttle body.
If this doesn't work THEN buy a new MAF.
I had this code and tried the cleaning method. CE light would return in a couple of months. Did this for 6 months or so, finally got tired of cleaning and bought new maf from Autohausaz. As Doug mentioned the engine will run much more smoothly with a new maf. Like a new engine. The cleaning may delay the activation of the CE light, but it apparently does not return the maf to proper function, IMO.
This is a source reference. Confirm exact model applicability in the original material.
