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1999 C2 - Help me decipher these OBD readings

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YOUR RESEARCH1999 C2 - Help me decipher these OBD readings

Leading reported evidence

Replace oxygen sensors

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Suggestion · Original poster

I�m quite curious if I should consider replacing the O2 sensors?

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1999 C2 - Help me decipher these OBD readings
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Leading evidence: 'Replace oxygen sensors' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace oxygen sensors' (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 matching discussions · 1 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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Replace oxygen sensors

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 · Original poster

I�m quite curious if I should consider replacing the O2 sensors?

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1999 C2 - Help me decipher these OBD readings
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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.

1 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: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I�m hoping that some of you trusted 996 wizards might help me to better understand this data from my buddy�s new OBDII reader. The car is a 1999 (9/98 build) C2 (throttle cable car) with an early engine replacement (which has a double row IMS and an 11/99 casting stamp on the crankcase). I�ve recently done a lot of work to the engine including new head/plenum intake gaskets, new Bosch plugs, new Beru coils, new Bosch evap solenoid, new Bosch MAF, new Bosch �996.2� injectors, and a new Bosch idle air control valve. The car has a RoW DME flash and thus will only display Bank 1 cam deviations and doesn�t require an operating SAI. Two different deviation values are shown below. The car initially showed 6 when we first started digging into the reader. After a short drive, it went down to 4 and then eventually settled on 5 while at idle after the drive. (Yes, I am aware of FSI and Porsche�s stance on those values). We were a bit surprised that his reader was able to pull data on the car. All values shown below are with the car running at hot idle. Outside air temp was in the mid to high 80�s. I�m quite curious if I should consider replacing the O2 sensors? I don�t know how old they but I�ve owned the car for 6.5 years so they are at least older than that. The car doesn�t currently throw any CELs though it does occasionally have a slight burble/unsteadiness at idle, which is most noticeable when the AC is off.

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