fullymatted.
Back to search
Planet-9

Solid yellow check engine light

Add to repair workspace
Open repair workspace
Original source
3 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHSolid yellow check engine light

Reported or suspected cause

cat

Suggestion or failed attempt

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
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 suspect a cause
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.

Suspected cause

guy and he thought it's most likely the CAT.

Original post Read captured discussion
Solid yellow check engine light
Read full discussion summary

Leading evidence: 'cat' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'cat' (1 discussions; 0 report identifying it and 1 suggest it). 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.

Read captured replies

1 matching discussions · 3 captured posts examined · 1 partial discussions

Reported and suspected causes (1)

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

cat

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.

Suspected cause

guy and he thought it's most likely the CAT.

Original post Read captured discussion
Solid yellow check engine light
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.

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

  • Planet-9: 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

It seems as though I am plagued by this notice on my Cayman . The code isPO421 (warm up catalyst below threshold bank 1. I've taken it to my Porsche guy and he thought it's most likely the CAT. mainly because I had it in storage all winter. I cleared the code at his place and then drove about 15 miles and it's come on again. Is this a serious condition? Or will it correct itself by drive it more? Some have said maybe an oxy sensor??? Any ideas?

POST 2Original post

The only ones that are serious to the point you should stop driving immediately are the ones where the MIL is flashing. Other than that yes you should get it fixed, but that doesn't mean firing the parts cannon. It means an actual diagnosis. It could be as simple as a frayed wire or some corrosion on a connection.

POST 3Original post

I agree. The car is nearly 20 years old..and spent most of its life in FL. Which we know will have a salt water effect. So corrosion on a cable could be likely. Thanks 😊

This is a source reference. Confirm exact model applicability in the original material.