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P0430 Porsche fault code 45 - cat conversion bank 2 exceeds limit value

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2 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHP0430 Porsche fault code 45 - cat conversion bank 2 exceeds limit value

Leading reported evidence

Replace water pump and thermostat

Suggestion or failed attempt

No successful repair reported for this finding.

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Reported fixes
0
Unsuccessful attempts
1
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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
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

I recently replace the water pump and thermostat on my 2001 996.

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P0430 Porsche fault code 45 - cat conversion bank 2 exceeds limit value
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Leading evidence: 'Replace water pump and thermostat' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace water pump and thermostat' (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.

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1 matching discussions · 2 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Replace water pump and thermostat

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

I recently replace the water pump and thermostat on my 2001 996.

Original post Read captured discussion
P0430 Porsche fault code 45 - cat conversion bank 2 exceeds limit value
Coverage and how to read this overview

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.

2 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Pelican Parts: 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: 20261026T222516Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

I recently replace the water pump and thermostat on my 2001 996. I removed the left-bank cat including the sensors in order make more room for changing out the pump and thermostat. Once the car was back in operation and after several miles of driving the CEL came on. The fault check code reads: P0430 Porsche fault code 45 - cat conversion bank 2 exceeds limit value. I cleared the code and after several days of driving its back on. However, the car is running great! No missing or cranky idle and the high is also very smooth. One more thing, when the light first came on we had been driving on a dusty road for several miles. Can you tell me what the code means? Are the O2 sensors bad or is it the cat? Or is there something else going on? Many thanks! __________________ This post was auto-generated based upon a question asked on our tech article page here: Porsche 911 Carrera Oxygen Sensor Replacement - 996 (1998-2005) - 997 (2005-2012) - Pelican Parts Technical Article

POST 2Original post

I believe there is a software fix for that fault? If the software does not fix the fault it is time for a new cat... I would also make sure that the sensors are tight and that all fasteners and gaskets have been properly installed. - Casey

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