23 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHMAF replacement
Leading reported evidence
Check actual
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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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 · Original poster
Checked actual running values of oxygen sensing adaptation, found adaptation values just over threshold to trigger check engine light.
Leading evidence: 'Check actual' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check actual' (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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Replace air/oil separator, expensive item will make sure 1
Suggestion or failed attempt
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Reported fixes
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Unsuccessful attempts
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Read evidence and context
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Suggestion
Replace air/oil separator, expensive item will make sure 1 to 3 are done first.
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23 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T024951Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I need to replace the MAF -- dealer did readout for CEL and found code P1126 -- "Read out fault codes, fault P1126 present. Checked actual running values of oxygen sensing adaptation, found adaptation values just over threshold to trigger check engine light. Mass air flow sensor is the cause of this fault."
We reset the CEL and I drove for three weeks to see if the CEL would come on again -- which it did in regular driving yesterday. The dealer wants $500+ to do the replacement (including the part).
Is this a simple plug and play item where it's worth the savings to get the part from Suncoast and install it (in my case having my regular mechanic for my other cars, a Mercedes guy, do it), or should I just have the dealer do it?
Does anyone have a photo of where the MAF is or a parts diagram?
Thanks!
Yes, it is plug and play. You dont even need any special tools. You can grip the retaining screws with a pair of pliers by grabbing the OD of the screw heads.
The plug is just a plug.
No. The screws are threaded into plastic so there is virtually no torque. You can grab the outside of the heads with pliers to remove and replace.
A little shade-tree but it works just fine.
bought all the security bits for an interchanageble screwdriver (including the Torx security bit for the MAF) $3.99(?) at HARBOR FRIEGHT. All came in a nice rubber case, too.
If the Porsche tech definitively stated that an 1126 code is a bad MAF, have another tech look at it. All a P1126 indicates is that bank 2 is running lean off throttle, which can be caused by half a dozen things other than a MAF.
+1
I've been getting CEL about once a week for some time; either P1126 or P1128. What these codes are communicating is that the DME can�t make the fuel mixture rich enough. Because the codes are occurring on both the left and right sides its likely not a fuel injector issue. After some research I'm in a process of doing the following:
1. Check oil cap. This I have done, I think I will replace it or see if I can find a replacement o-ring.
2. Try and put a vacuum on the intake system and see if it holds. Researching how to do that right now.
3. Replace fuel filter, will likely just do it.
4. Replace air/oil separator, expensive item will make sure 1 to 3 are done first.
Then if all this fails replace the MAF.
You're right that the O2 sensors are trying to richen the mixture, but an 1126 and 1128 are totally different. 26 is a problem at idle and a 28 is a problem on throttle.
This is a source reference. Confirm exact model applicability in the original material.
