POST 1 / ORIGINAL POSTEROriginal post
Pretty sure I understand what an AOS on our cars are for, my question is around failure. What actually fails when an AOS goes bad? Is it an internal valve, something electrical? School me please........
5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
Discussion summary
YOUR RESEARCHAOS Failure
1 matching discussions were examined; no attributable action/outcome evidence was detected. No consensus or repair conclusion is claimed.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Read captured repliesInsufficient extracted evidence does not mean there is no answer in the original discussions.
1 matching discussions · 5 captured posts examined · 0 partial discussions
Coverage and how to read this overview
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.
5 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.
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
POST 2Original post
there are posts showing cut outs of aos showing the internal failed parts the search button is you best friend !!!
POST 3Original post
Part: http://www.pelicanparts.com/cgi-bin/...-M253&make=POR It sounds and looks like this: Porsche 996 AOS Oil filler cap test and smoke - YouTube Porsche 996 AOS Scream - YouTube Not sure exactly what fails, something about the rubber baffles inside? I don't know. All I know is mine failed last night.
POST 4Original post
Quotes source post: 13223326
My 2002 Boxster is on its 3rd AOS. I get around 80K to 120K miles from an AOS. I cut one apart and the failure I found was the fabric reinforced diaphragm had a crack/split probably from material fatigue. The 996 has at least one other failure mode and it involves a crack that lets coolant leak out onto the engine or leak and get into the engine/crankcase.
POST 5Original post
They look crooked when they failed AOS Failure
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