Rennlist

P1123 & Information Overload

Add to repair workspace

New repair projectOpen repair workspace

Original source

4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHP1123 & Information Overload

Leading reported evidence

Check fuel trims rkat (tra if 99-2000)

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
Check your fuel trims RKAT (TRA if 99-2000).
Original post Read captured discussion
P1123 & Information Overload

Read full discussion summary

Leading evidence: 'Check fuel trims rkat (tra if 99-2000)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuel trims rkat (tra if 99-2000)' (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.

Read captured replies

1 matching discussions · 4 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Check invoice

Suggestion or failed attempt

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
I know the cats are original and I have receipts for O2 sensors replacements (I'll check the invoice for which code was actually being read and fixed)
Original post Read captured discussion
P1123 & Information Overload

Clean mass air flow sensor

Suggestion or failed attempt

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
If your fuel trims on both sides are off, clean the MAF with CRC MAF cleaner as directed, then check them again....The stuff works..
Original post Read captured discussion
P1123 & Information Overload

Frequently discussed actions (3)

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

Check fuel trims rkat (tra if 99-2000)

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
Check your fuel trims RKAT (TRA if 99-2000).
Original post Read captured discussion
P1123 & Information Overload

Check invoice

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
I know the cats are original and I have receipts for O2 sensors replacements (I'll check the invoice for which code was actually being read and fixed)
Original post Read captured discussion
P1123 & Information Overload

Clean mass air flow sensor

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
If your fuel trims on both sides are off, clean the MAF with CRC MAF cleaner as directed, then check them again....The stuff works..
Original post Read captured discussion
P1123 & Information Overload

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.

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

Rennlist: 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: 20261028T003752Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

CEL came on in my 996 the other day. Grabbed a code reader and it came back as P1123 which is a rich condition on bank 1, cyl 1-3. I've been searching around and there is just so many opinions and possible solutions out there my head is spinning. I'd like to actually troubleshoot this and find the root cause. Been about a decade since I've dealt with gas job emissions I've been driving diesels for that long. Most threads I see on this topic also reference P1125 which indicates the same condition on the other bank. Mine was only one code, P1123. Because it's on one bank, I can rule out the MAF. I know the cats are original and I have receipts for O2 sensors replacements (I'll check the invoice for which code was actually being read and fixed) The other topic I saw being discussed was high fuel pressure, I assume this means in just one rail? The final thing I saw was a leaky fuel injector. I don't have a rich/gasoline smell out of the exhaust but I guess that only counts for so much. Any insight is appreciated. G

POST 2Original post

Open your oil cap and smell. These injectors are old and due if original...

POST 3Original post

Quotes source post: 16461773

Check your fuel trims RKAT (TRA if 99-2000). your other Bank may be just barely be in range. If your fuel trims on both sides are off, clean the MAF with CRC MAF cleaner as directed, then check them again....The stuff works..

POST 4 / ORIGINAL POSTEROriginal post

Quotes source post: 16461943

I don't think my 40$ eBay scanner can do any of that

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