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Porsche Club GB

911 C4S cabriolet water ingression

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

Discussion summary

YOUR RESEARCH911 C4S cabriolet water ingression

Leading reported evidence

Set alarm off

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 removed mine, cleaned it down and dried it out (airing cupboard) and it worked a bit better but did random unlocking and setting the alarm off.

Original post Read captured discussion
911 C4S cabriolet water ingression

Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.

Frequently discussed work

Run pipe

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

The most awful piece of (over) design - why not just run a pipe from the drain hole to the outlet in the wheel arch?!?!?!

Original post Read captured discussion
911 C4S cabriolet water ingression
Read full discussion summary

Leading evidence: 'Set alarm off' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run pipe' (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 · 2 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Run pipe

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

The most awful piece of (over) design - why not just run a pipe from the drain hole to the outlet in the wheel arch?!?!?!

Original post Read captured discussion
911 C4S cabriolet water ingression

Use 3 locks

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

I can go fine as it is, just that I need to use 3 locks to lock the car.

Original post Read captured discussion
911 C4S cabriolet water ingression
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.

Run pipe

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

The most awful piece of (over) design - why not just run a pipe from the drain hole to the outlet in the wheel arch?!?!?!

Original post Read captured discussion
911 C4S cabriolet water ingression

Set alarm off

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 removed mine, cleaned it down and dried it out (airing cupboard) and it worked a bit better but did random unlocking and setting the alarm off.

Original post Read captured discussion
911 C4S cabriolet water ingression

Outcome qualification: Negation, uncertainty or missing explicit repair resolution overrides the raw extraction signal.

Use 3 locks

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 can go fine as it is, just that I need to use 3 locks to lock the car.

Original post Read captured discussion
911 C4S cabriolet water ingression
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.

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

  • Porsche Club GB: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 1 adjusted by outcome qualification.

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

Generation: 20261026T124918Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi all So we had a heavy downpour a few weeks ago, and there was a lot of damp in the nearside passenger carpets and had a few days needing to be drained out. I know this is due to blocked drain pipes, and these are now cleared out (apparently the front ones were the cause, so I am unsure why this would lead to draining in the rear). Now of course the ECU is messed up and I think will need to be replaced at some time. I can go fine as it is, just that I need to use 3 locks to lock the car. Can anyone give me an estimate as to how much a new ECU will be? I have seen posts of around £400, so that plus VAT and labour, I am guessing somewhere around £1,000? Also, will this be a recurring issue, that I need to worry about leaving my car out in the rain in case it happens again? Anything I should be looking out for regularly to make sure everything is in good order? It seems nuts that a blocked drain can cause so much damage that it leaks onto the ECU, but there we go. Thanks, Dominic

POST 2Original post

Had exactly the same problem, mine was the internal rear drain reservoirs (?) behind the speaker. The most awful piece of (over) design - why not just run a pipe from the drain hole to the outlet in the wheel arch?!?!?! Anyway... I removed mine, cleaned it down and dried it out (airing cupboard) and it worked a bit better but did random unlocking and setting the alarm off. A new M534 alarm module was £429 (with 10% PCGB discount) from Porsche Centre Colchester (guess prices are the same everywhere). Less than ones on eBay from Lithuania which I was advised to avoid like the proverbial plague. You need someone with the right kit to make the car accept it, get the keys to work properly, etc - the genius behind MDB Diagnostics sorted mine https://www.mdbdiagnostics.co.uk/ - I won't say for how much but it was surprisingly un Porsche like! Car's been absolutely fine since.

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