8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCodes P1121, P1124 and P1126
Reported or suspected cause
sure the maf sensor
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
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 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
If you haven't cleared the codes/ reset the fuel trims, then just look at the range 1 near idle fuel trim and if it is -0.36 , the problem is for sure the MAF sensor.
Leading evidence: 'sure the maf sensor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'sure the maf sensor' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check air pump system is working correctly at warm-up' (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.
Check air pump system is working correctly at warm-up
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
Might want to check your air pump system is working correctly at warm-up and for vacuum leaks.
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
If you have already cleared/reset everything, then drive it untill it comes back..Then check range 1 fuel trims.
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.
Replace sensors over the next 12 months if i haven't
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
Not an expert of any of the sensors, but I have an 02 with 57k miles and I am in the process of replacing all my sensors over the next 12 months if I haven't already.
Replace sensors over the next 12 months if i haven't
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
Not an expert of any of the sensors, but I have an 02 with 57k miles and I am in the process of replacing all my sensors over the next 12 months if I haven't already.
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
If you haven't cleared the codes/ reset the fuel trims, then just look at the range 1 near idle fuel trim and if it is -0.36 , the problem is for sure the MAF sensor.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
sure the maf 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
If you haven't cleared the codes/ reset the fuel trims, then just look at the range 1 near idle fuel trim and if it is -0.36 , the problem is for sure the MAF sensor.
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.
8 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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: 20261026T024951Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Greetings all.
My 1999 C2 has been running great since I bought it. On Friday I had it out for a good drive and it crossed the 160,000 KM threshold - I know its not lots, but it is still a threshold.
Around the same time as hitting 160,000 the CEL comes on. When I got home I checked the codes and I have Confirmed P1124 and P1126 as well as a Pending 1121. I understand that these codes are related to Oxygen Sensing, Oxygen Sensor and MAF issues. I do not sense any change in idle issues.
I was wondering - is it just a coincidence that the odo turn 160,000 at about the same time the CEL comes on? Did Porsche pre-program a service interval that lit the CEL? My 1980 911SC had an Oxygen Sensor light that would light up and designated intervals.
Looking for some answers on this before I start delving in to further examination and possible replacements.
thanks
jb
OMG! So you drive around in your car and deeply suspect that the manufacturer has pre-programmed error codes in the ECU at particular mileage intervals? How do you live with these thoughts? Do you think this about all of your vehicles? Do you have other vehicles? How do you handle oil change intervals?
1121 is Throttle Position Sensor 1
1124 is Full Pump Relay Output Stage
1126 is Oxy Sensing Adaptation Lower Load Range Bank 1
Not an expert of any of the sensors, but I have an 02 with 57k miles and I am in the process of replacing all my sensors over the next 12 months if I haven't already. The 996 is now 20+ years old. Stands to reason a few may eventually go bad.
I believe these 3 codes for a '99 3.4L (DME 5.2.2) are all O2 sensor related...P1121 is O2 sensor heating error, & P1124 & 26 are LH & RH O2 sensors at rich threshold. Might want to check your air pump system is working correctly at warm-up and for vacuum leaks.
Thanks for the positive responses. I did not know whether 20 years ago Porsche had pre-programmed some maintenance needed alerts as opposed to a failure.
Will do some exploring when the weather cooperates.
jb
If you haven't cleared the codes/ reset the fuel trims, then just look at the range 1 near idle fuel trim and if it is -0.36 , the problem is for sure the MAF sensor. I've seen it 100 times.
If you have already cleared/reset everything, then drive it untill it comes back..Then check range 1 fuel trims.
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