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Small Evaporative System Leak (P0456) - parts replace, still present

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHSmall Evaporative System Leak (P0456) - parts replace, still present

Leading reported evidence

Replace gas and the vent valve

Performed · outcome unconfirmed

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 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

I have replaced the gas and the vent valve already.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present
Frequently discussed work

Check bottom hose of the aos

No successful repair reported for this finding.

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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

You might want to check the bottom hose of the AOS which you can see from under the car up high near the back drivers wheel.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present
Read full discussion summary

Leading evidence: 'Replace gas and the vent valve' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'small vacuum leak' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check bottom hose of the aos' (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 4 other evidence results

small vacuum leak

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

Probably a small vacuum leak which are very hard to detect.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present

Check bottom hose of the aos

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

You might want to check the bottom hose of the AOS which you can see from under the car up high near the back drivers wheel.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present

Check of the components related

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

I would start by checking all of the components related to the fuel system and evap system located under the battery tray and behind the passenger wheel liner.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present

Replace while i am in there

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

Any suggestions for other items to replace while I am in there?

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present
Frequently discussed actions (6)

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

Check bottom hose of the aos

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

You might want to check the bottom hose of the AOS which you can see from under the car up high near the back drivers wheel.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present

Check of the components related

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

I would start by checking all of the components related to the fuel system and evap system located under the battery tray and behind the passenger wheel liner.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present

Replace gas and the vent valve

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

I have replaced the gas and the vent valve already.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present

Replace while i am in there

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

Any suggestions for other items to replace while I am in there?

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present

Run from the engine

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

It might be one of the vacuum lines that run from the engine to the evap system.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present

Smoke-test on the car

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

do a full smoke test on the car.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present
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.

small vacuum leak

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

Probably a small vacuum leak which are very hard to detect.

Original post Read captured discussion
Small Evaporative System Leak (P0456) - parts replace, still present
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: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I have a recurring CEL. I have replaced the gas and the vent valve already. When sitting at a stop light for an extended time (1 min+) after driving I can detect the scent of fuel vapour in the cabin. It seems, but not scientifically verified, that it's more discernible when the the car is on a slope. I am thinking that the valve I got might be defective. Any suggestions for other items to replace while I am in there?

POST 2Original post

do a full smoke test on the car. YouTube has a lot of useful info. Probably a small vacuum leak which are very hard to detect. With the engine running it shows several ways to find a leak. Propane or brake cleaner liquid. You might want to check the bottom hose of the AOS which you can see from under the car up high near the back drivers wheel. Its an accordion short rubber boot that tends to weep oil. If it weeps oil then it can suck air in there and into the crankcase. Good luck. You will need plenty of luck to find a small leak. Let us know if you find the leak. Thanks.

POST 3Original post

Did you figure this out? I have the same code and rough idle

POST 4Original post

I would start by checking all of the components related to the fuel system and evap system located under the battery tray and behind the passenger wheel liner. Remember, the cabin air intake is located under the hood up next to the battery, which is maybe why you are smelling gas fumes in the cabin. Check everything up there including the filler pipe and clamps. It might be one of the vacuum lines that run from the engine to the evap system. See fuel tank and related components here http://www.autoatlanta.com/porsche-p...section=201-00

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