10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 C4 ABS & PSM Warning lights
Reported or suspected cause
earth connection/strap affecting battery & guage
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
It turned out to be a faulty earth connection/strap affecting battery & guage !
Replace control unit/pump assembly and drained and refreshed the system
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
I have a 2001 C4 which I bought a few weeks ago from an OPC - after a couple of days the ABS and PSM lights came on and I called the dealer who arranged for it to be collected through Porsche Assistance - they have been good at keeping me abreast of developments but thus far are baffled as to the cause - they have replaced the control unit/pump assembly and drained and refreshed the system but the problem still persists.
Leading evidence: 'earth connection/strap affecting battery & guage' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'earth connection/strap affecting battery & guage' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Replace control unit/pump assembly and drained and refreshed the system' (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.
Replace control unit/pump assembly and drained and refreshed the system
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
I have a 2001 C4 which I bought a few weeks ago from an OPC - after a couple of days the ABS and PSM lights came on and I called the dealer who arranged for it to be collected through Porsche Assistance - they have been good at keeping me abreast of developments but thus far are baffled as to the cause - they have replaced the control unit/pump assembly and drained and refreshed the system but the problem still persists.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Replace control unit/pump assembly and drained and refreshed the system
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
I have a 2001 C4 which I bought a few weeks ago from an OPC - after a couple of days the ABS and PSM lights came on and I called the dealer who arranged for it to be collected through Porsche Assistance - they have been good at keeping me abreast of developments but thus far are baffled as to the cause - they have replaced the control unit/pump assembly and drained and refreshed the system but the problem still persists.
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.
10 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: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I posted this in the wrong section !!! - hopefully this is the right one!
I have a 2001 C4 which I bought a few weeks ago from an OPC - after a couple of days the ABS and PSM lights came on and I called the dealer who arranged for it to be collected through Porsche Assistance - they have been good at keeping me abreast of developments but thus far are baffled as to the cause - they have replaced the control unit/pump assembly and drained and refreshed the system but the problem still persists. Anyone had a similar problem?
Regards
Dave
I have heard and experienced this and whilst the lights you mentioned were lit they were not reflecting the cause of the problem which was the air mass sensor. Just thought that it may help!
Hi Dave,
another Grant replying !
Can't help with this particular problem , but I think you may have fun. I had a (sort of) similar issue with electronics as the oil pressure guage has never worked correctly. Many trips to the OPC eventually led them to order a complete new instrument pod, but just as this arrived they sorted the problem whilst rectifying a battery drain issue. It turned out to be a faulty earth connection/strap affecting battery & guage ! Best of luck in finding your electrical gremlin, keep us posted.
Regards
Grant
Just thought I'd keep you up to date - sadly following replacement of the air mass sensor the problem still persists - I received an answer on Friday to my call last Monday to Porsche Customer Relations - the person dealing with my problem was very courteous and apologetic however the problem has not been resolved and although Porsche Assistance have provided a loan car - a brand new Mercedes E-Class 270 Diesel - which although very comfortable is no substitute for a Porsche!!!!!
The team seem baffled and their customer (me) getting increasingly frustrated - so far the message is "we'll sort it out - but can't tell you by when!!!!"
Any help appreciated
Gary et al,
Thanks - just returned from a business trip and still have no resolution - approaching six weeks now !!! - at least I have been provided with a Boxter S loan car....... latest thinking is the master cylinder and I await the verdict - however now I'm totally fed up with this particular 996 ownership and have requested a refund - however I'm not sure that the dealer wants to play ball.
Will again keep you posted.
Regards
Dave
My 996 goes in with a loud vibration from the Front diff/torque channel, at least you have had some decent loan cars, I'm getting a Golf!!. Not knocking the Golf's just against a 996?
Wouldn't of minded a boxster for a day or two!
I am really frustrated with some of thses dealers. Why don't they just replace all the bits it could be - surely it shouldn't take this long to find the problem?
I assume that are only a limited number fo things it could be.
