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2002 Porsche Targa P0172 (System too rich Bank 1)

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH2002 Porsche Targa P0172 (System too rich Bank 1)

Reported or suspected cause

actually a vac leak

Reported cause

No successful repair reported for this finding.

1
Identified cause: 0
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 report identifying 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.

Reported cause · Original poster
Got the MAF switched back to the original, which we still had due to finding out a previous issue was actually a vac leak and that the MAF never needed replacing.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Frequently discussed work

Check resistance

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
Check resistance on O2 sensors etc?
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Read full discussion summary

Leading evidence: 'actually a vac leak' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'actually a vac leak' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check resistance' (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 · 8 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Replace maf and alternator due

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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.

Performed · outcome unconfirmed · Original poster
Ive recently replaced the MAF and alternator due to another error.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Replace mass air flow sensor

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1
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.

Performed · outcome unconfirmed · Original poster
Swapped the MAF.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Suggestion
Did you replace the MAF with a Genuine Porsche one?
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Run waveforms

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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.

Performed · outcome unconfirmed · Original poster
Ran the waveforms on all O2 sensors, as well as on fuel trim.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Check resistance

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
Check resistance on O2 sensors etc?
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Frequently discussed actions (7)

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

Check resistance

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
Check resistance on O2 sensors etc?
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Check resistances

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
Should I pull plugs/check resistances on coils?
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Check wave forms

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
So basically just checking the wave forms on them?
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Replace maf and alternator due

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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.

Performed · outcome unconfirmed · Original poster
Ive recently replaced the MAF and alternator due to another error.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Replace 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 performed work without a confirmed outcome: 1
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.

Performed · outcome unconfirmed · Original poster
Swapped the MAF.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Suggestion
Did you replace the MAF with a Genuine Porsche one?
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Run lot better

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
Car seems to run a lot better.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

Run waveforms

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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.

Performed · outcome unconfirmed · Original poster
Ran the waveforms on all O2 sensors, as well as on fuel trim.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

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.

actually a vac leak

No successful repair reported for this finding.

1
Identified cause: 0
Suspected cause: 0
Reported fixes

Read evidence and context

Discussions that report identifying 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.

Reported cause · Original poster
Got the MAF switched back to the original, which we still had due to finding out a previous issue was actually a vac leak and that the MAF never needed replacing.
Original post Read captured discussion
2002 Porsche Targa P0172 (System too rich Bank 1)

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.

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: 20261027T184158Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hey all. So my 2002 Targa has been running really rough and throwing a P0172 System Rich Bank 1 code. Ive recently replaced the MAF and alternator due to another error. Are there common known causes for this error code? Should I pull plugs/check resistances on coils? Check resistance on O2 sensors etc? Thanks

POST 2Original post

I would be looking at a graph of the bank1 pre and post cat sensor. You want to see if they r lazy or not working.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 18204622

So basically just checking the wave forms on them? Im assuming start the car, wait a few minutes for it to come off of choke, then check to see that the voltages are cycling between ~.1 and ~.8? Should the pre and post both be cycling? Or just pre?

POST 4Original post

Did you replace the MAF with a Genuine Porsche one? Fueling rich issue can be, MAF, leaking fuel pressure regulator ( 996.1 ) , leaking injectors...Fuel Saturated Carbon Canister...

POST 5Original post

Yes my suggestion was just to confirm the o2 is working properly. If they look like they r trying to send signals for adjustment and not just flat lined then u need to figure out why. P-tech covered the possible whys in his post. Good luck.

POST 6 / ORIGINAL POSTEROriginal post

Quotes source post: 18205290

Got the MAF switched back to the original, which we still had due to finding out a previous issue was actually a vac leak and that the MAF never needed replacing. Ran the waveforms on all O2 sensors, as well as on fuel trim. Pictures posted below. See anything �fishy.�

POST 7Original post

To me the post cat sensors both look lazy. Mine have more of a range. Try to see if they move more if u hold 2500 rpm or ramp the trottle. U basically want to see all 4 sensors moving around through their range. U dont really want to see a pattern as they r constantly trying to get the motor to an optimal state. Were u able to clear the code and if so did it stay off for a while?

POST 8 / ORIGINAL POSTEROriginal post

Quotes source post: 18206515

Swapped the MAF. Car seems to run a lot better. No codes for a while! I guess time will tell.

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