8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCatalyst Codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Clean air intake system
Suggestion or failed attempt
No successful repair reported for this finding.
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0
Unsuccessful attempts
1
Discussions
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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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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Catalyst Codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Clean air intake system' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean air intake system' (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 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
Imho the catalytic converters clean themselves when they have been at temperature for long enough.
Catalyst Codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use can of crc guaranteed
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
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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.
Suggestion · Original poster
Last smog I had a P0430 that I successfully got rid of using a can of CRC guaranteed to pass, even though its not "for" catalytic converter monitoring.
Catalyst Codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use oxicat, o2 sensor spacers, and o2 sensor filters
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
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've heard of success stories using Oxicat, O2 sensor spacers, and O2 sensor filters.
Catalyst Codes - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use can of crc guaranteed
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
Last smog I had a P0430 that I successfully got rid of using a can of CRC guaranteed to pass, even though its not "for" catalytic converter monitoring.
Catalyst Codes - 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.
8 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.
Outcome without a verified action link
Between then and now I had an AOS failure with tons of oil smoke that I'm sure didn't help the situation.
My smog is due next February, and today P0420 and P0430 popped up when the monitoring finally completed.
Last smog I had a P0430 that I successfully got rid of using a can of CRC guaranteed to pass, even though its not "for" catalytic converter monitoring.
Between then and now I had an AOS failure with tons of oil smoke that I'm sure didn't help the situation.
I've heard of success stories using Oxicat, O2 sensor spacers, and O2 sensor filters. What's worked for everyone here? I don't want to buy another set of converters. Is there an OTS tune which can trick the readiness sensors? How do people with catless headers pass?
Imho the catalytic converters clean themselves when they have been at temperature for long enough. If the catalytic converters are physically in order (nothing rattles when you knock on the housing), warm up the engine and then don't run it below 3,000 rpm for as long as possible, go uphill. You can support this with an additive in the tank, i'm not a fan of that. Afterwards, you can also do an oil- and oilfilter change if it's due anyway.
Ok I actually happened to commute up a extended uphill road today. Kept it at 4000+ rpm and saw a healthy amount of smoke out the back. Hopefully that was the cats getting hot and not just my spark plug tubes lol.
But did you clean the air intake system? A failing AOS dumps lots of stuff into the air intake and all over the throttle body. Plus are all the hoses solid and secure. It is an old car and stuff ages.
I have 0 oil consumption for the 3 years I’ve had the car aside from spark plug tube leak. However that’s never made a quantifiable change in oil level including now.
Also no to cleaning out the intake. I think all the residual oil is burned off already. It’s been a month or more since the AOS was swapped out and for the few days following it I saw some smoke out of the tailpipe but nothing after that unless there’s a pool of it that’s remaining until higher vacuum force from high RPMs suck it in.
