10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHABS and PSM warning light on
Leading reported evidence
Check brake lights and all appears well
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.
Leading evidence: 'Check brake lights and all appears well' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'maf if it happened' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check brake lights' (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
Here are the equivalent Bosch part numbers for the 3 MAF types used on the 996, which you will find cheaper at ECP or another Bosch distributor.
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 suspect a cause
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suspected cause
As you say, most likely the MAF if it happened under hard acceleration.
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.
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
Brake switch problem same on my C4S too, n/s/f light was coming on while braking then ABS and PSM failure resolved by changing brake switch under warranty.
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
Brake switch problem same on my C4S too, n/s/f light was coming on while braking then ABS and PSM failure resolved by changing brake switch under warranty.
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: 20261026T142254Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi,
2000 C4. Driving today, and when I accelerated hard in 3rd gear the ABS and PSM amber lights came on and remained on. After switching ignition on and off they have cleared? Any ideas why and where to look first.
I have not done a fault code scan yet as I do not have the equipment required.
Thanks
jetbox
To answer my own question; from some more searching it looks like it could be the MAF on the way out.
Can anyone clarify before I go and purchase one.
Thanks
As you say, most likely the MAF if it happened under hard acceleration. Any idea how many miles it has done on the MAF? If it is 50,000+ then it's probably living on borrowed time anyway.
Richard,
There is no record of a MAF change in the extensive history I have> Car has 99000 miles so I guess its time.
Where is the cheapest place to buy?I can not find on eurocarparts. Is £250 about right?
Thanks
Jetbox
For a 2000 C4 you need Porsche part number 996.606.124.00 and they are a whopping £435.89 inc VAT from an OPC. Here are the equivalent Bosch part numbers for the 3 MAF types used on the 996, which you will find cheaper at ECP or another Bosch distributor. Try Lloyd Deakin at http://www.fpuk.co.uk as he is about the cheapest I have found. (LloydSix on 911UK).
Porsche Number - Bosch Number
996.606.123.00 - 0280 217 007
996.606.124.00 - 0280 218 009
986.606.125.01 - 0280 218 055
Edit: Just found this, which might be useful as a comparison http://www.airflowmeters.co.uk/SearchAdvanced.aspx?PerformSearch=manufacturercode&SearchValue=0280%20218%20009 Best to check it is an original Bosch part though.
Edit 2: I just dug up a quote that Lloyd gave me last September:
0280 218 009 - £155.00 INC VAT & UK Postage.
It was some while ago, so don't know if it still applies.
Jetbox,
Did you check your brake lights. Same happened to mine and diagnostics discovered brake pedal switch problem. Cheap and easy fix and all well now.
Initially thought MAF or brake sensors so relieved when was not.
Brake switch problem same on my C4S too, n/s/f light was coming on while braking then ABS and PSM failure resolved by changing brake switch under warranty.
Could be the brake light switch, or even an ABS sensor, but because it happens on hard acceleration I think it is most likely the MAF. Especially since it has done 99,000 miles. Even if it isn't the MAF at this time, I think it would still be a wise preventative measure to change it now.
