9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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YOUR RESEARCHSecondary catalytic converter question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Install gas cap
Performed · outcome unconfirmed
No successful repair reported for this finding.
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Performed · outcome unconfirmed · Original poster
I bought an installed a new gas cap because my old one had cracks in the o ring.
Secondary catalytic converter question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Install gas cap' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'cats' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Install gas cap' (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.
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 performed work without a confirmed outcome
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.
Secondary catalytic converter question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
cats
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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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Suspected cause · Original poster
Yea I'm not sure how they figured out it was the cats.
Secondary catalytic converter question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
cats just
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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 suspect a cause
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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 · Original poster
If they just pulled the p0430 and concluded that it was the cats just from that I'd be pretty upset.
Secondary catalytic converter question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace gas cap
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
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Suggestion
Or is it a kind of rivet that I need a new one when replacing the gas cap?
Secondary catalytic converter question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Hello, my 01 base couldn’t pass smog because of a p0430 code. The shop diagnosed it and they said both the primary and secondary right cats were bad. They wanted 2700 for new cats and oxygen sensors which I thought was ridiculous because that’s half the price of the car. My question is do I need to buy a new secondary cat? I thought there weren’t any sensors past the primaries so it wouldn’t make sense to spend all that money. Any help is appreciated
You are correct - there is a sensor before and after the precat (on the header) but none that monitor the main cat (aka secondary cat). Id be curious how the figured that the cats are bad though...
Rumor has it that the most common cause of that code is a bad gas cap. You may wanna start there.
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Yea I'm not sure how they figured out it was the cats. If they just pulled the p0430 and concluded that it was the cats just from that I'd be pretty upset. I bought an installed a new gas cap because my old one had cracks in the o ring. I guess I'll just drive it for a bit and see if the cel turns off. Thank you for your help!
Hey! Just a quick update to thank you and to help anyone in the future who has a similar problem. I took your advice and bought a new gas cap for like $15. Put it on and the cel went away! So much better than the $2700 the shop quotes me for new cats lol, so thank you! I've also heard that the oil cap can cause the same code but the gas cap was the one that did it for me.
Great to hear that this worked out for you.
How the gas cap 'string' line is attached to the car body - I have a new gas cap and thought the swp to be very easy, but the nut / rivet holding the security 'string' holding the cap from falling off is still a mystery. Before braking the rivet, how I can take it out or can I?
Or is it a kind of rivet that I need a new one when replacing the gas cap?
I replaced my cap a few years ago. The rivet has a central portion that eases out of the surrounding portion. Pull it out first and then the whole thing will come out easily. You may need a trim tool or screw driver to remove the central portion.
Easy: P0430 is the code for a failing main three way catalytic converter. I seriously doubt the gas cap had anything to do with it as that is not what the DME is looking at, and a gas cap failure code is completely different, usually a large vacuum leak code such as P0445, not a cat failure code.
This is a source reference. Confirm exact model applicability in the original material.
