Porsche Club GB

ABS failure warning light on C4S 2003

Add to repair workspace

New repair projectOpen repair workspace

Original source

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

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHABS failure warning light on C4S 2003

Leading reported evidence

Install next week

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
They tell me it is the brake light sensor so a new one has been ordered and will be fitted next week.
Original post Read captured discussion
ABS failure warning light on C4S 2003

Frequently discussed work

Check done

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
Best bet is to get a diagnostic check done, which should tell you for sure.
Original post Read captured discussion
ABS failure warning light on C4S 2003

Read full discussion summary

Leading evidence: 'Install next week' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'mass air flow sensor' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check done' (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 · 5 captured posts examined · 0 partial discussions

Compare 2 other evidence results

mass air flow sensor

Suggestion or failed attempt

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
If it did it under heavy acceleration, and clears when you re-start the car, it is most likely the MAF.
Original post Read captured discussion
ABS failure warning light on C4S 2003

Check done

Suggestion or failed attempt

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
Best bet is to get a diagnostic check done, which should tell you for sure.
Original post Read captured discussion
ABS failure warning light on C4S 2003

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.

Check done

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
Best bet is to get a diagnostic check done, which should tell you for sure.
Original post Read captured discussion
ABS failure warning light on C4S 2003

Install next week

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
They tell me it is the brake light sensor so a new one has been ordered and will be fitted next week.
Original post Read captured discussion
ABS failure warning light on C4S 2003

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.

mass air flow sensor

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
If it did it under heavy acceleration, and clears when you re-start the car, it is most likely the MAF.
Original post Read captured discussion
ABS failure warning light on C4S 2003

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.

5 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 · 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
fortunately didnt go rushing out to buy a new switch & £3.49 cured it....
Original post Read captured discussion
No unique explicit quoted action; no causal link assigned

Generation: 20261026T112012Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

This suddenly came on on the way to work this morning???? It advises me to go to a workshop, ok makes sense. anyone any ideas if this is a serious fault? states ABS and PMS off. Thanks...

POST 2Original post

3 likely culprits are: Brake light switch ABS Sensor MAF sensor If it did it under heavy acceleration, and clears when you re-start the car, it is most likely the MAF. If it is random and intermittent, it is more likely to be the brake light switch. If permanently on, and doesn't clear, then it could be an ABS sensor. Best bet is to get a diagnostic check done, which should tell you for sure.

POST 3 / ORIGINAL POSTEROriginal post

Thank you Richard. They tell me it is the brake light sensor so a new one has been ordered and will be fitted next week. Appreciate your help.

POST 4Original post

I had a management warning light on my everyday car recently, brake light switch indicated but on checking the obvious both brake light bulbs had blown even though the tailgate led's were still working it threw up a fault.... obviously due to a drop in circuit voltage!! fortunately didnt go rushing out to buy a new switch & £3.49 cured it.... happy days[ ]

POST 5 / ORIGINAL POSTEROriginal post

Brake switch changed and all is well. Thanks all ....[ ]

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