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Pelican Parts

Evaporative emission system faults 996, 997

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

Discussion summary

YOUR RESEARCHEvaporative emission system faults 996, 997

Leading reported evidence

Reset code - and it comes

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

Watching my driving habits, I reset the code - and it comes on reliably after about 30 minutes of driving while taking off from a stop.

Original post Read captured discussion
Evaporative emission system faults 996, 997
Frequently discussed work

Check fuel trim values while out

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 recommend using your scanner to check the fuel trim values while out on your drive.

Original post Read captured discussion
Evaporative emission system faults 996, 997
Read full discussion summary

Leading evidence: 'Reset code - and it comes' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuel trim values while out' (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

Use durametric scanner, and don't have a reading

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

I'm using the Durametric scanner, and don't have a reading on Fuel Trim...

Original post Read captured discussion
Evaporative emission system faults 996, 997

Use durametric scanner, and don't see a reading

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

I'm using the Durametric scanner, and don't see a reading for fuel trim -- or anything particularly relevant in this area.

Original post Read captured discussion
Evaporative emission system faults 996, 997

Check fuel trim values while out

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 recommend using your scanner to check the fuel trim values while out on your drive.

Original post Read captured discussion
Evaporative emission system faults 996, 997

Check function of the vent valve

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

Is there a recommended way to check the function of the vent valve before I replace it?

Original post Read captured discussion
Evaporative emission system faults 996, 997
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 fuel trim values while out

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 recommend using your scanner to check the fuel trim values while out on your drive.

Original post Read captured discussion
Evaporative emission system faults 996, 997

Check function of the vent valve

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

Is there a recommended way to check the function of the vent valve before I replace it?

Original post Read captured discussion
Evaporative emission system faults 996, 997

Recommend way

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

Is there a recommended way to check the function of the vent valve before I replace it?

Original post Read captured discussion
Evaporative emission system faults 996, 997

Reset code - and it comes

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

Watching my driving habits, I reset the code - and it comes on reliably after about 30 minutes of driving while taking off from a stop.

Original post Read captured discussion
Evaporative emission system faults 996, 997

Use durametric scanner, and don't have a reading

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

I'm using the Durametric scanner, and don't have a reading on Fuel Trim...

Original post Read captured discussion
Evaporative emission system faults 996, 997

Use durametric scanner, and don't see a reading

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

I'm using the Durametric scanner, and don't see a reading for fuel trim -- or anything particularly relevant in this area.

Original post Read captured discussion
Evaporative emission system faults 996, 997

Use scanner

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 recommend using your scanner to check the fuel trim values while out on your drive.

Original post Read captured discussion
Evaporative emission system faults 996, 997
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.

  • Pelican Parts: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

1 acknowledgements have no verified action link; they do not establish a repair result.

Outcome without a verified action link

Thought I had this fixed with driving habits, until it came on again about a week ago (while best behavior in place).

Original post Read captured discussion

No unique explicit quoted action; no causal link assigned

Generation: 20261026T091943Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1Original post

I get the P0455 major leak combined with P0450 Tank pressure. Watching my driving habits, I reset the code - and it comes on reliably after about 30 minutes of driving while taking off from a stop. Seems to be coordinated with letting the clutch out - could it be because the pressure is dropping to the vent valve with the RPMs? Is there a recommended way to check the function of the vent valve before I replace it? Thank you for your expertise. __________________ This post was auto-generated based upon a question asked on our tech article page here:

POST 2Original post

What year is your Carrera? Seems to me that you've got an evap leak somewhere. The source of the leak could be the evap canister purge valve. I would recommend using your scanner to check the fuel trim values while out on your drive. If you notice them moving all over the map rich and lean chances are you have a faulty evap canister purge valve. If they stay mostly lean I would be looking for an EVAP leak. The purge valve is located in the engine compartment on the driver side. - Casey

POST 3Original post

Thanks, it's an '01. Thought I had this fixed with driving habits, until it came on again about a week ago (while best behavior in place). I'm using the Durametric scanner, and don't see a reading for fuel trim -- or anything particularly relevant in this area. Thanks for the suggestion on the canister purge valve... I was originally thinking it may be the fuel line vent valve... which I need to research more... they seem the same, but different location across different years? I suppose it could be a general evap leak, but that sounds difficult/expensive to diagnose... Thanks for any more advice.

POST 4Original post

Thank you for the advice. Mine is an '01. Is this the same as the Fuel Line Vent valve? I'm using the Durametric scanner, and don't have a reading on Fuel Trim... or any thing else that seems relevant. I guess your recommendation may have been for a different year. I'll start digging in and looking for a general evap leak, but that sounds a bit more time consuming.

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