17 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCEL and cat failure
Leading reported evidence
Replace factory sport mufflers
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Performed · outcome unconfirmed
Also replaced my Factory Sport Mufflers with Fabspeed.
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Suggestion
If you leave it as is the engine controller will strive to adjust the fueling for that bank to try to bring the #2 O2 sensor's reading into an acceptable range.
Leading evidence: 'Replace factory sport mufflers' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust fueling' (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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Performed · outcome unconfirmed
Also, don't waste your time with a Salvage yard, it is against the law to sell used Cats.
Use fabspeed sport cats and have had great success
Performed · outcome unconfirmed
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0
Unsuccessful attempts
1
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Performed · outcome unconfirmed
I used Fabspeed Sport Cats and have had great success with them.
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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Performed · outcome unconfirmed
I have a set of cargraphics mufflers (purchased used off of rennlist) and the stock headers.
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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Suggestion
If you leave it as is the engine controller will strive to adjust the fueling for that bank to try to bring the #2 O2 sensor's reading into an acceptable range.
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Adjust fueling
No successful repair reported for this finding.
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0
Unsuccessful attempts
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Read evidence and context
Discussions that contain suggestions
1
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Suggestion
If you leave it as is the engine controller will strive to adjust the fueling for that bank to try to bring the #2 O2 sensor's reading into an acceptable range.
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
One option is to repair your factory cats - they seem to fail the same way which is not difficult to repair and keeps your car Smog Legal if you're in CA.
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.
17 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T094842Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Had a CEL come on last night. My dealer pulled the codes this morning for free. Looks like I have a failed cat.
What are my options. I passed smog recently. Now there is rattling in one cat and a CEL code. I don't have to pass smog for another 2 years.
Bypass? Run it as is?
Aaron
You have several options but the best one is to probably replace the damaged/defective converter. I'd opt for a stock/factory one though if you can find one from a salvage yard that's a cheaper (possibly) solution.
If you run a bypass you are in violation of emissions laws. I know some do not care but I thought I'd mention this.
If you leave it as is the engine controller will strive to adjust the fueling for that bank to try to bring the #2 O2 sensor's reading into an acceptable range.
This can result in less than optimum fueling for that bank. The engine will almost certainly under perform and that bank might over time suffer extra/accelerated wear from the less than optimum fueling.
Sincerely,
Macster.
Options. FVD appears to be the obvious choice
FVD
https://rennlist.com/forums/996-foru...a-knockin.html
Fabspeed
https://rennlist.com/forums/996-foru...200c-cats.html
Both! I haven't put it on our dyno yet but it feels like another 20+ hp, even my wife could tell.
I have a set of cargraphics mufflers (purchased used off of rennlist) and the stock headers. The sound it killer!!! At around 3,000 RPM's it makes a great note! not loud driving on the street but awesome when at WOT. At the track a few weeks ago I had a few people (GT3 owners) ask me about it. One of our techs took some video and photos but his computer crashed.
No lie I haven't turned on the radio since I installed it.
I have a 2003 996 C2 and had my cats fail as well. I used Fabspeed Sport Cats and have had great success with them. Also replaced my Factory Sport Mufflers with Fabspeed.
Also, don't waste your time with a Salvage yard, it is against the law to sell used Cats.
Have either of you noticed the lag issue referred to in this post:
https://rennlist.com/forums/996-foru...ferrerid=96313
I asked Joey at Fabspeed about it but after an initial promise to look into their progress on the issue he never got back to me. I've heard lots of positive feedback about Fabspeed, and am considering this mod but want to be sure about it. q
I got lucky with my '02. Both cats failed just before the 8 year Federal emissions system warranty expired. My cats failed about 6 months apart, both times while I was running DE's.
Against the law to sell used cats? Where do you live?
One option is to repair your factory cats - they seem to fail the same way which is not difficult to repair and keeps your car Smog Legal if you're in CA.
Yeah, my cold may be your hot these days. I won't tell you what the temp is today...
It really is a great mod. I haven't had the check engine light come on once, and the o2 sensors look normal.
Hey aaronazevedo, sorry to hear about your cat failure, but it is a known thing that happens after time. Our 200 Cell Sport Cat will keep the CE light Off and make a nice HP and sound improvement depending on your muffler setup. It will comply with emissions and you will have not problems passing. We use only the highest quality HJS Sport Cats from Germany to ensure no issues with CE lights or anything else. Let me know if you have any questions and if you are looking for a replacement Cat for it, shoot me a PM and I will give you more information on our Sport Cat and special member pricing.
Thanks,
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