7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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Discussion summary
YOUR RESEARCHOBDII code question, sjfehr Nails it!
Leading reported evidence
Check oil fill cap and make sure it's
Suggestion or failed attempt
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Read evidence and context
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Discussions that contain suggestions
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Suggestion
AOS, MAF and vacuum leak could all cause this error, but the 1st troubleshooting step is the easiest: check your oil fill cap and make sure it's on tight.
Leading evidence: 'Check oil fill cap and make sure it's' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check oil fill cap and make sure it's' (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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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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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
Before you replace that O2 sensor, use an OBDII reader to watch the sensor output.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check oil fill cap and make sure it's
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
AOS, MAF and vacuum leak could all cause this error, but the 1st troubleshooting step is the easiest: check your oil fill cap and make sure it's on tight.
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T055238Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
P1128: "Oxygen sensing adaptation, idle range, cyl. 1-3". Could be a short circuit or fuel/air mix problem. Are you also getting P1130 (same error, but cyl 4-6)?
AOS, MAF and vacuum leak could all cause this error, but the 1st troubleshooting step is the easiest: check your oil fill cap and make sure it's on tight. Other possible issues could cause it, too, including a bad O2 sensor.
Got only the one code which makes is side specific. I will check the oil fill cap anyway. Car has 123,000 miles on it, could easily be a bad O2 sensor, which should be cheap and easy to replace.
AOS got replaced maybe 20k ago. I would expect a vacuum leak might also cause a bit higher idle, yes? Idle seems fine and on target.
PS, got a reference source for the "MFG specific" codes? (which this is)
I just got a P2096 on mine driving home today!
I did some research and it seems to point to the oxygen sensor. Gretch - you mentioned it's a cheap fix, where's the best place to buy one?
I would get it from my indy, but we have that sort of relationship. I would guess any of out P car vendors can source them, too.
First I wanna confirm exactly what it is. BTW 1-3 bank is the driver's side bank, correct?
Before you replace that O2 sensor, use an OBDII reader to watch the sensor output. It will help determine if your sensor is bad, or if it's reading lean because there's a crack in your exhaust or a small vacuum leak on one side of the intake or whatnot. There are other clues in the data- a trained technician can probably pinpoint the most likely culprit and eliminate a lot of trial & error repairs (O2 sensors are not cheap!).
Here's a plot of my car cold-starting that you can use as baseline of a typical M96 for comparison. After secondary air injection cuts off and the system goes into closed-loop feedback, pre-cat should be /\/\/\/\/\/ as per Porsche's algorithm, and post-cat O2 sensor output should be steady ------ around 0.7-.8V. (I grabbed this data with my android smartphone and a $20 bluetooth OBDII reader, btw.)
83HOH.png
