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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPorsche Regeneration Valve from Throttle Body for Fuel Vapor System
Reported or suspected cause
mass air flow sensor
Suggestion or failed attempt
No successful repair reported for this finding.
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1
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0
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Suspected cause
Codes P1124 P1126 are usually accompanied by negative -0.36 and is caused by a MAF Sensor that is dirty and sending a higher kg/h value than is expected..( should be about 15kg/h at warm idle A/C off)
Porsche Regeneration Valve from Throttle Body for Fuel Vapor System
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Leading evidence: 'mass air flow sensor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'mass air flow sensor' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Recommend oe porsche maf sensor' (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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Porsche Regeneration Valve from Throttle Body for Fuel Vapor System
Replace with non-bosch maf
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Suggestion · Original poster
I did originally change out my MAF after trying to clean it to no avail, but El cheapo here did replace with non-Bosch MAF.
Porsche Regeneration Valve from Throttle Body for Fuel Vapor System
Run depends
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Suggestion
Basically everything running depends on the MAF sensor, so don't go "el cheapo".
Porsche Regeneration Valve from Throttle Body for Fuel Vapor System
Set ...also the maf kg/h value
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No successful repair reported for this finding.
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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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Suggestion
You need to use a Durametric or PIWIS to get the TRA/RKAT values that are present AFTER the code is set ...also the MAF kg/h value....
Porsche Regeneration Valve from Throttle Body for Fuel Vapor System
Reported and suspected causes (1)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
mass air flow sensor
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect 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.
Suspected cause
Codes P1124 P1126 are usually accompanied by negative -0.36 and is caused by a MAF Sensor that is dirty and sending a higher kg/h value than is expected..( should be about 15kg/h at warm idle A/C off)
Porsche Regeneration Valve from Throttle Body for Fuel Vapor System
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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.
6 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T033439Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
1999 996 coupe with 122K miles. P1124 and P1126 codes reappear after deleting and only driving a few miles. Car runs fine and no white smoke. I'm assuming that I have a throttle body leak somewhere. Thought it might be the valve that connects charcoal canister to throttle body. Attached a picture of the valve below.
My understanding is this valve would be closed at all times except when power is put to it. With a hand vacuum pump attached to either end of this valve, it will not hold vacuum. Should it hold vacuum? Could this be my problem? The vacuum bleeds off fairly rapidly. Thanks in advance for any help.
Yes it should hold vacuum, but that "may" not be the source of your fault codes....( a small leak can be compensated for by the DME/fuel trims)...
You need to use a Durametric or PIWIS to get the TRA/RKAT values that are present AFTER the code is set ...also the MAF kg/h value....
A positive value of 0.36 means there is a lean condition ( possible vacuum leak) more than can adjusted for....
A negative value of -0.36 means there is a rich condition ( possible MAF sensor) more than can be adjusted for...
Codes P1124 P1126 are usually accompanied by negative -0.36 and is caused by a MAF Sensor that is dirty and sending a higher kg/h value than is expected..( should be about 15kg/h at warm idle A/C off)
Thanks for the response. I did originally change out my MAF after trying to clean it to no avail, but El cheapo here did replace with non-Bosch MAF. It does seem to be "working" to some degree based on my cheap Bluetooth scanner. But perhaps that's my problem. I'll try to post the MAF outputs that I am seeing. Thanks again.
I bought a TPI brand MAF part# MAF 1127 ($50 vs $160 for Bosch - current Rockauto prices). Could that be my problem?. I'm probably going to just go swap out for the Bosch model. Attached is a data recording from MAF which it looks to be averaging about 3.4 g/sec (~12.2 kg/hr). I believe the Gap in time on the chart is just a flaw in data recording with my app.
Our engines are particularly sensitive to the MAF sensor. Basically everything running depends on the MAF sensor, so don't go "el cheapo". I recommend the OE Porsche MAF sensor. Yes, it is expensive but worth it.
