13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
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Use durametric
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Leading evidence: 'Use durametric' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check change over valves and vacuum hoses' (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.
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Suggestion
If it turns on then u need to check the change over valves and vacuum hoses.
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Suggestion
If it doesnt u need to check for voltage and go from there.
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.
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Suggestion · Original poster
Suppose i need to clean/replace the air intake filter?
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Suggestion · Original poster
Suppose i need to clean/replace the air intake filter?
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.
13 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261027T013556Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Gents,
My 2001 911 C2 has been running great all winter but now have swtiched over to more AC related driving now that Houston is warming up. I got a check engine light yesterday afternoon leaving work. Used the Durametric to identify and clear codes:
PO139 - Sensor ageing behind cat conv cyl 1-3
PO410 - Secondary air injection system cyl 1-3
P1411 - Secondary air injection system cylinder 4-6
Has anyone seen this combo before? Suppose i need to clean/replace the air intake filter?
Has nothing to do with the air filter. Secondary Air Injection (SAI) system pumps air into the exhaust system to "light the cats" at first cold start (it's an emission thing). The faults with the SAI system should be explored before condemning the O2 sensor(s). The SAI pump is in the engine compartment drivers side. Does it run and make a vacuum cleaner sound when you cold start the car?
I didnt notice anything running yesterday when leaving the office. I normally hear something running when i'm at home, taking my time starting the car up. More of a high pitched noise but i def hear something that sounds like air flowing or being pushed at a high rate.
Clear the codes. You can use the activations part of Durametric to activate the SAI pump and see if it runs. Then drive and see if the codes come back.
Think i can find the pump but where is the change over valve located? I saw that Pelican sells the change over valves but didnt see the actual pump listed.
Its kinda behind the alternator. There r some simple tests that u can do with the durametric. Basically command the pump to turn on. If it doesnt u need to check for voltage and go from there. If it turns on then u need to check the change over valves and vacuum hoses. Do the diagnostic work....dont just throw parts at it.
The SAI check valves fail and when they do, they fail in a way that prevents air from the SAI to getting into the exhaust manifold. In the 2001, it is a two part valve. In the update it is one. As it has been said, it is behind the alternator. It was originally a two part system. Now a one part
https://www.pelicanparts.com/More_In...M&KeepHeader=Y
You have to remove the alternator to get to it. I don't have the time now, but there is a definitive test for failure of the check valve. I will try to get this on here in 24 hours.
Remove the alternator.
Apply 12 to the air pump, left side of your engine bay. See if air is coming out the output side of hose 14.
Do a smoke test on the vacuum line 12. If there is a leak, fix it.
Apply vacuum using a hand pump to the vacuum port of the control valve, number 11. See if air is coming output side of hose 10.
If air is coming out of hose 10, and you are getting those two error codes, then valve 9 is bad. Change it.
