Question about 1996 Porsche 911
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Posted on Jan 02, 2017
SOURCE: i got codes p0410 and p1411
You are correct, these are secondary air injection codes. It is under the passenger side intake manifold. There's 3 pieces that
can be bad, an electric vacuum switch that's controlled by the ecu, the
control valve which is activated by vacuum from the first part and a
one-way valve. Also, a vacuum leak in the circuit can cause the same
fault code. The one-way valve can be checked simply by blowing into it,
it should allow flow in the direction of the arrow but not the other.
The vacuum control valve can be tested off the car by applying a vacuum
to it, it will make a clear thunking noise when it activates. I'm not sure
how to test the electric solenoid, since it is activated by the ECU it
would work off of 5 volts. It seems like all 3 pieces would run about
$100 so it would not be out of the question to replace all 3 while
you're in there. Make sure
you orient the electric valves the way they are on the car or you'll
get the codes again.
The only sketchy thing about doing it yourself is that you do have to remove the plastic intake manifold on that side, and it is a real PITA to get to. Evidently it is fine to re-use the o-ring gasket that seals it to the aluminum stacks. I hope this helps and good luck!
Posted on Nov 03, 2009
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