9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPSM and ABS warning
Reported or suspected cause
brake light switch
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying 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.
Reported cause
I had this last year it was the brake light switch.
Leading evidence: 'brake light switch' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'brake light switch' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check indy' (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.
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
£ 10 later & new switch fitted by me & problem banished !
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
Same for me, simple check for an Indy to run and replace in a few mins
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
A diagnostic check should reveal which of these is the suspect.
Replace & the faulty brake light causes the abs ecu
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 combination of ABS sensor seeing a sudden speed change & the faulty brake light causes the ABS ECU to interpret as possible ABS fault & illuminate those warning lights)
Replace & the faulty brake light causes the abs ecu
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 combination of ABS sensor seeing a sudden speed change & the faulty brake light causes the ABS ECU to interpret as possible ABS fault & illuminate those warning lights)
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.
9 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.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T073501Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi,
I seem to have an intermittent problem with the warning lights coming on for the PMS and ABS. It usually goes off when the car is restarted. Anyone have a solution or should I be concerned? Doesnt seem to have an effect on the car? Been happening on and off for a while. I do have a suspension issue to sort (front coffins I think). Would that cause this? Daft question probably.
Thanks for any response.
I had that a few years ago - would usually happen while braking on rough roads . Various people on here pointed me at a faulty brake light switch.
(the combination of ABS sensor seeing a sudden speed change & the faulty brake light causes the ABS ECU to interpret as possible ABS fault & illuminate those warning lights)
I had someone couple a tester up to the car & that was confirmed the likely culprit. £ 10 later & new switch fitted by me & problem banished !
Paul
2004 911 C2 40th Anniversary
The 3 most likely culprits are:
Brake light switch - note that even if the brake lights are working properly, that doesn't mean it is OK. There are two sets of contacts inside.
MAF Sensor - this happens because the DME and ABS/PSM controller communicate, and there is an implausible signal sent from the DME to the ABS/PSM. This won't throw the Check Engine Light (as you would expect) because UK 996s are not programmed to switch on the CEL due to a failing MAF. This usually manifests itself on heavy acceleration.
An ABS Sensor - a failing sensor or bad connection can cause these symptoms.
A diagnostic check should reveal which of these is the suspect.
