8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHO2 sensor
Leading reported evidence
Replace with the newer model
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
Unsuccessful attempts
1
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Read evidence and context
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
It sure sounds like Ahsai is correct, and your cats were replaced with the newer model.
Leading evidence: 'Replace with the newer model' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check light was now off' (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.
Discussions that contain suggestions
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Suggestion · Original poster
I can only assume that at one time they were changed.I do have a remanufactured motor from Porsche installed in 2004.Maybe at that time a different cat was put in.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion · Original poster
I can only assume that at one time they were changed.I do have a remanufactured motor from Porsche installed in 2004.Maybe at that time a different cat was put in.
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: 20261026T191851Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have a code that indicates O2 sensor problems. I was on the assumption that Carrera had 4 sensors. Two before the cat and two aft of the cat. I can see clearly the sensor before the cat, but the one aft is not evident. On my car, it is not on the exhaust pipe after the cat. But there is a sensor of some sort on the top of the cat. Would this be considered the aft sensor?
The upstream (before) sensor is a couple of inches before the body of the converter; the downstream (aft) sensor is located just before the clamp between the catalytic converter and the muffler. In the following image, the upstream sensor is on the right and the downstream on the left. To clarify, your car has 2 catalytic converters, and each cat has two O2 sensors.
I don't have a Mk2 .It is a 2000 gen 1.But I do have at the middle of the cat a sensor and probably that is the post cat sensor Thank you for the picture but I don't have that downstream sensor in between the cat and the muffler, That was my concern.It would have been easier if so.
Any pics? The cats on a 2000 should look like what Schnell posted. This is the cat from Mk II with the bungs plugged. The post cat sensor goes on to the left bung and the pre cat the right bung. I suspect you don't have stock cats or someone swapped in MkII cats.
https://rennlist.com/forums/parts-ma...left-side.html
It sure sounds like Ahsai is correct, and your cats were replaced with the newer model. I wonder if there are any other surprises waiting for you to discover them.
Thanks guys. Yes ,the last picture does seem to be the model cat I have.It would then be a MKII cat. I can only assume that at one time they were changed.I do have a remanufactured motor from Porsche installed in 2004.Maybe at that time a different cat was put in. The important thing for me at this time is to correctly change the post- cat O2 sensor and you seem to have given me the answer with MKII assumption.
I drove it today and the check light was now off. I guess I will wait to see if it returns. I have the new O2 sensor so I will wait and keep it for another day
This is a source reference. Confirm exact model applicability in the original material.
