911uk

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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Leading reported evidence

Disconnect battery and leaving it

Suggestion or failed attempt

No successful repair reported for this finding.

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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.

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Suggestion
I would try disconnecting battery and leaving it for half an hour before re attaching.
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Leading evidence: 'Disconnect battery and leaving it' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Disconnect battery and leaving it' (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.

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Replace ecu's

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 1
Unsuccessful attempts: 1
Discussions

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Discussions that report an unsuccessful attempt: 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.

Unsuccessful attempt
Got one from van Zweeden in Holland and it didn't solve the problem but when the car was back with the indie, another C4 was in and we swapped ECU's which cured it - weird.
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Frequently discussed actions (2)

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

Disconnect battery and leaving it

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 try disconnecting battery and leaving it for half an hour before re attaching.
Original post Read captured discussion
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Replace ecu's

No successful repair reported for this finding.

0
Reported fixes: 1
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that report an unsuccessful attempt: 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.

Unsuccessful attempt
Got one from van Zweeden in Holland and it didn't solve the problem but when the car was back with the indie, another C4 was in and we swapped ECU's which cured it - weird.
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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.

911uk: 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: 20261026T142254Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

my 964 sat idle for a couple of weeks and the RAC had to start it.ever since my 4WD and ABS warning lights come on after about 10 seconds and will not go out....any ideas please? Migration info. Legacy thread was 60930

POST 2Original post

It could be a coincidence, or an ABS sensor is knackered. Migration info. Legacy thread was 60938

POST 3 / ORIGINAL POSTEROriginal post

thanks william....are the abs and the 4 wheel drive warning related? Migration info. Legacy thread was 60940

POST 4Original post

could be anything as simple as a fuse or relay or in the worse case the booster pump or abs control unit Migration info. Legacy thread was 61010

POST 5Original post

How's life in Kenya, Sid? Better than a curry house in Ivor, I'll bet (had to ask Sundeep if you were the guy at the curry night - but at least I put 2 and 2 together and got the right answer) Migration info. Legacy thread was 61013

POST 6Original post

opc kenya is great the weather sunny .will have come down to iver for another curry Migration info. Legacy thread was 61014

POST 7Original post

This happened to my '89 964 C4. Initially this would happen on and off but in the end the lights would stay on. Took it to my indie/supplier who concluded that the ECU had to be replaced. Now these are as rare as rocking horse sh*t to find. Got one from van Zweeden in Holland and it didn't solve the problem but when the car was back with the indie, another C4 was in and we swapped ECU's which cured it - weird. Hope it works out for you. Migration info. Legacy thread was 61022

POST 8Original post

I would try disconnecting battery and leaving it for half an hour before re attaching. Make sure you have all radio/alarm codes etc first !! Migration info. Legacy thread was 61159

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