7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHPSM and ABS failure
Reported or suspected cause
brake light switch behind the pedal
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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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 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 was lucky - it was the brake light switch behind the pedal so just over a tenner.
Install cloth and mesh type performance filter, not a k&n
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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
The reason this happened on mine was because someone had fitted a cloth and mesh type performance filter, not a K&N, but had fitted the filter from a Carrera which in essence has the same rectangular footprint but with a cut out to clear the air con pump so part of the mouth of the filter body was not masked properly so some crap got in.
Leading evidence: 'brake light switch behind the pedal' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'brake light switch behind the pedal' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Install cloth and mesh type performance filter, not a k&n' (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 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.
switch rather than anything more wallet threatening
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
In fact thinking about it when I went to Northway they hooked up the diags and knew straight away it was the switch rather than anything more wallet threatening.
Install cloth and mesh type performance filter, not a k&n
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
The reason this happened on mine was because someone had fitted a cloth and mesh type performance filter, not a K&N, but had fitted the filter from a Carrera which in essence has the same rectangular footprint but with a cut out to clear the air con pump so part of the mouth of the filter body was not masked properly so some crap got in.
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
Mine only seemed to happen on a gentle brake rolling up to a junction and reset the lights each time the car was restarted.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Install cloth and mesh type performance filter, not a k&n
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
The reason this happened on mine was because someone had fitted a cloth and mesh type performance filter, not a K&N, but had fitted the filter from a Carrera which in essence has the same rectangular footprint but with a cut out to clear the air con pump so part of the mouth of the filter body was not masked properly so some crap got in.
switch rather than anything more wallet threatening
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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
In fact thinking about it when I went to Northway they hooked up the diags and knew straight away it was the switch rather than anything more wallet threatening.
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.
7 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: 20261027T173940Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi
Can anyone help
Just flagged up on the dash readout
PSM failure
ABS failure
Initially happened after braking this morning
It's not fogged up again on other trips since but is still in the computer under checks.
I did notice a couple of times the abs/pedal pulling in on braking in the dry over the past week or two.
Any one suggest what could be the issue as it appears to be of intermitte fault? 😪
Thanks in anticipation
If you google you'll see loads of different options from cheap to expensive which caused me immense fear when I had it in my turbo. I was lucky - it was the brake light switch behind the pedal so just over a tenner. Mine only seemed to happen on a gentle brake rolling up to a junction and reset the lights each time the car was restarted. If you know someone near you, you might be able to swap theirs and try it or maybe a local indie.
In fact thinking about it when I went to Northway they hooked up the diags and knew straight away it was the switch rather than anything more wallet threatening.
Mass airflow sensor failure gives same symptoms and is common cause - had it twice in 8 years - MAF sensor both times.
Turning ignition off seems to resolve - only to return as revs rise.
Quite a few references on the site
https://www.porscheclubgb.com/forum/tm.asp?m=842804&mpage=1&key=MAF󍱫
A faulty throttle body or turbulent air caused by debris behind the removable plastic mesh can also give a pasm and abs fault but this is rare. The error code is 1152 IIRC and the diagnostic tree takes you via mass airflow sensor to throttle control unit, In order of expense brake light switch, MAF, and throttle body. Guess which one fixed mine? I say fixed because once you have got it all apart with the £670 throttle body in your hand and on reassembly you just happen to check out the body of the air filter box and notice a bit of crap you then wonder if the crap was disrupting the air flow giving spurious information. The reason this happened on mine was because someone had fitted a cloth and mesh type performance filter, not a K&N, but had fitted the filter from a Carrera which in essence has the same rectangular footprint but with a cut out to clear the air con pump so part of the mouth of the filter body was not masked properly so some crap got in. I reverted to the std paper filter on Richard's recommendation and it has not missed a beat in 3 years and 14,000 miles. For the sake of your wallet we are all keeping our fingers crossed that it is something as cheap as a brake light switch.
As Mat has said try a new brake switch first.
I had exactly the same thing and spent a load of time messing about getting the MAF checked and cleaned and nearly bought a new one. It was the brake switch all along.
http://www.design911.co.uk/fu/prod7161/Switch-brake-pedal-Porsche-997-MKII---987-MKII---987C-MKII-99661311302/
Great to hear. In my case I have not changed the brake light switch, so it cant be at fault because I no longer get the errors. I might just mention that with mine there was a give away of erratic and random high speed idle of anything up to 1,800 rpm.
Thanks for the link Andy
I've ordered a brake light switch as a starter.
The code has gone this morning.
Hopefully some intermittent issue that may have cleared but will fit the new switch once it gets her.
😀
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