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p0446 - emission control system vent circuit mailfunction

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHp0446 - emission control system vent circuit mailfunction

Leading reported evidence

Repair shop 3 times (which includes this time)

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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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
I have had the car almost 5 and a half years (35000miles) and its only been in the repair shop 3 times (which includes this time).
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p0446 - emission control system vent circuit mailfunction

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Leading evidence: 'Repair shop 3 times (which includes this time)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Repair shop 3 times (which includes this time)' (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 · 6 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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

Repair shop 3 times (which includes this time)

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 have had the car almost 5 and a half years (35000miles) and its only been in the repair shop 3 times (which includes this time).
Original post Read captured discussion
p0446 - emission control system vent circuit mailfunction

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.

6 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: 20261026T174436Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I have a check engine light on the dash. p0446 - emission control system vent circuit malfunction. Hoping you guys can help me with. Car is running as normal. Lots of power, no missing, smooth as silk. Thanks in advance for any help in this matter. A few pointers would not go amiss.

POST 2Original post

Hi Hurdi, sounds like your evap line is blcked or the fuel evap canister is bad. Please see the pdf in this thread: http://www.renntech.org/forums/topic/36978-code-p0446/

POST 3Original post

Isn't that the same code that is thrown when your gas cap seal goes kaput? Hurdi, did this coincide with a recent fill-up?

POST 4 / ORIGINAL POSTEROriginal post

Quotes source post: 13427639

I checked that and the seal looks ok. I believe the 446 code covers about 5 things that could go wrong so I have booked it into Porsche for them to find it rather than sling money at the car in the hope that I find the actual fault. It goes into Porsche this coming friday. Thanks guys.

POST 5Original post

Most often the after cat O2 sensors lead to this, in my experience... Or a vacuum leak.

POST 6 / ORIGINAL POSTEROriginal post

Quotes source post: 13428034

Thanks Jake. I will let the pros sort this one out for me. I have had the car almost 5 and a half years (35000miles) and its only been in the repair shop 3 times (which includes this time).

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