14 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHABS/PSM failure but no codes?
Reported repair
Repair by changing the maf
Reported resolution
1
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 report a fix
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: 'Repair by changing the maf' (1 discussions report resolution; 0 report an unsuccessful attempt). Across 1 matching discussions, the most frequently mentioned possible cause is 'deeper' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Repair by changing the maf' (1 discussions). For that action, 1 discussions report a resolution and 0 report an unsuccessful attempt. The most frequently reported fix is 'Repair by changing the maf', supported by resolution reports in 1 discussions. 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
I replaced my water pump started the car to check for looks and let it warm up.
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
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
It can be an easy fix like cleaning your MAF and throttle body....but unfortunately it can be also be a needle in a haystack search if the issue is deeper.
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
I replaced my water pump started the car to check for looks and let it warm up.
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.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
deeper
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
It can be an easy fix like cleaning your MAF and throttle body....but unfortunately it can be also be a needle in a haystack search if the issue is deeper.
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.
14 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 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
Ultimately I think it was related to uneven tire wear/tire size difference because the problem went away when I got new tires, but I never really confirmed that just never happened again after new tires.
Decided to go for a drive today in my 99 C4 and about 30 minutes in I got both the ABS and PSM LEDs to light up. The break pedal did feel as if the brake booster/ABS pump was not working because the 996 brakes started to feel like my old 914. Still went for a spirited drive but when I got home I connected the car to my Durametric. The ABS/PSM 5.3 module seems to work fine, but the durametric tool could not return a code. Has anyone here had an ABS fault but no code return? Also, during my drive I did stop and start 3 times and the ABS/PSM leds would light up again after a few minutes. Any ideas? should I just go ahead and replace the ABS pump? Thanks for your help.
Do a search there are many threads on this topic. It can be an easy fix like cleaning your MAF and throttle body....but unfortunately it can be also be a needle in a haystack search if the issue is deeper. I had the issue on my 2003 C2 with no codes. Ultimately I think it was related to uneven tire wear/tire size difference because the problem went away when I got new tires, but I never really confirmed that just never happened again after new tires.
Great. So the PSM/ABS warning could be anything. I guess I start doing some more reading into this but I'm going to test out the ABS pump first to see if it could in fact be the problem. Thanks for the reply's.
I'd clean the MAF 1st... mine did exactly the same as yours. Lights came on during hard acceleration. Restarted the car and they went off. The came on again shortly afterwards.
Fixed by changing the MAF.
Actually, what it feels like now after driving the car around a bit more is the pedal is not returning as quickly as it should after being pressed. I'm not sure what would be causing a slow pedal return. Anybody have any ideas?
I had a case once where the brake light switch was faulty/ out of adjustment causing the abs to fault light to come on. Seems the abs expects to see the brake light signal before it sees brake hydraulic pressure, if it see's hydraulic pressure before it see's brake light signal it will illuminate the abs fault light..
I think the problem I have is simular to this. The brake pedal is not returning right away, almost like the return spring is weak or the pedal bushings are worn. The brake pedal seems to have some drag on the return. I'm going to take apart the pedal assembly this weekend and see what I can find.
This happened to me today. I replaced my water pump started the car to check for looks and let it warm up. I looked inside and saw ABS and PSM failed. I drove it anyway to let it warm up fully so I could check and see if I needed to add more coolant. When I got back, I hooked up code reader but didn't get any codes. I started the car and the ABS and PSM lights were out. I didn't drive it again but will tomorrow. Fingers crossed!!!!!
Check that you plugged in the MAF cable securely after you put the air intake back in. I forgot that step once and got the ABS and PSM lights, but I think I got a code.
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