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Po411 code need possible fixes - 2006 Pontiac Grand Prix

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Secondary Air Injection System Incorrect Flow Detected, what does this mean? you need to replace the secondary air injection check valve, when u buy the part from the local GM dealer ask him or her to give u a print out of the location from the parts diagram reference book, they almost always will, the part is about $100

Posted on May 25, 2010

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DTC P0411 Secondary Air Injection (AIR) System


Looking around i found a similar problem posted with a pic of a ruptured check valve ...if ruptured would this for sure cause a rich mixture?if so..this may also explain my engine noise i thought was orinally manifold gasket blowby... the code was P0411.

It might have a small effect on fuel mix if it's the upstream valve, but not enough to notice. If it was the downstream valve, it would only throw a cat efficiency code. Check the next graphics as reference...

po411 code need possible fixes - cae4dba.jpg


546e740.jpg





Hope help (remmeber rated this).

Posted on May 25, 2010

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The air injection system has a problem, You will need a diagnostic scanner to test the pump to begin with and then you need to make sure you have no vacuum leaks and if everything checks out then you most likley have a back pressure check valve that is clogged and needs to be replaced

Posted on May 25, 2010

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The AIR pump puts air to the exhaust to lower emissions. It takes in outside air and pumps it through two one-way check valves into each bank of the exhaust.
About 90% of the time that this code is set, the one-way check valves have worn out or failed and allow water (which occurs naturally in the exhaust) back into the pump. In any cold climate, especially in climates with higher humidity, this water may be more excessive. The water partially fills the AIR pump, it can then freeze. When the PCM commands the pump on, if the pump is frozen it cannot turn, thus overloading the circuit and "popping" the fuse.

In here you can find the Trouble Codes List:
The CODE mean P0411 Secondary Air Injection System Incorrect Flow Detected

Good luck!!!

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