Question about 2001 Lincoln LS

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Lincoln 1996 what does po411 means what the problem

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  • Anonymous Mar 06, 2009

    1996 lincoln continental po411 code, will not pass inspection, how expensive to fix?

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Secondary AIR System Incorrect Upstream Flow Detected

Possible cause:
Electric air injection pump hoses leaking
Air pump blocked
AIR bypass solenoid leaking or blocked
AIR bypass solenoid stuck open or stuck closed

Posted on Mar 04, 2009

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  • Lincoln Master
  • 61,249 Answers

DTC P0411 indicates Secondary Air not detected. In order to test the pump, it must be capable of driving the HO2S lean.

Posted on Mar 04, 2009

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Diagnostic code po411


The P0410 code refers to the emissions system.
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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