P0411 , calling SWEDECAR! - Saab 9-3SS Bulletin Board - Saabnet.com
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P0411 , calling SWEDECAR!
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Posted by MC [Email] (#1472) [Profile/Gallery] (more from MC) on Mon, 1 Oct 2018 11:02:24 Share Post by Email
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Anders,
Figured you could help me best with some heady diagnosis here.

2003 9-3SS (vector).
The notorious Code P0411 for "SAI system, incorrect air flow" is busting my mind.


Previously: diagnosed failed AIR PUMP. and was replaced with "OEM" Pierburg. The system was re-tested and PASSED On-board readiness test OK.

about a month later (now) the code came back. Pump still operational and performing well/strong flow. Pump-intake hose and charge-air side hose & connections all OK.
Removed the SAI combi-valve and found some saturation of black goo. Pretty wet stuff and not appearing to be very intrusive, but recommended for replacement while removed anyway.
Combi-valve exhaust pipe appeared clear at the outlet port.

Smoke tested for possible blockage....OK, BUT found a MINOR leak at the SAI exhaust-pipe mounting-flange near cylinder #1 area at the backside of the cylinder head. Shrugged it off at that point and put it all back together.

INTERESTING PART NOW:
new combi-valve now installed.
While performing drive-cycle for OBD readiness confirmation the CHECK ENGINE MIL came back on at the ~3 cold start.
Check OBD readiness and it said SAI system OK/PASS. But the P0411 code has returned. ???

Short of repairing the exhaust leak at the pipe flange/s, is the ANYTHING else we can attribute the return fault to?

Also, any explanation to suffice;
Why did it PASS readiness for SAI, but set a fault code anyway?

Trying to wrap my head around this. neew some better insight.

many thanks.
-MC

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