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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 753 (Engine Controls - Powertrain DTC Charts & Descriptions - CNG, Flex-Fuel & Gasoline) >> Diagnostic Trouble Code (DTC) Charts >> P0411: Secondary Air Injection (Air) System Upstream Flow

P0411: Secondary Air Injection (Air) System Upstream Flow

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P0411 - SECONDARY AIR INJECTION (AIR) SYSTEM UPSTREAM FLOW

Description:  The secondary air injection system does not detect the presence of air in the exhaust when introduced by the secondary air injection system.
Possible Causes: 
  • AIR bypass solenoid circuit open.
  • AIR bypass solenoid leaking/blocked or stuck open/closed.
  • Electric AIR pump - no/low air flow.
  • AIR diverter valve leaking/blocked or stuck open/closed.
  • AIR air hoses restricted or leaking.
  • AIR vacuum hoses restricted or leaking.
Diagnostic Aids:  In order to test the AIR pump, it must be capable of driving the HO2S lean. A single electrical circuit open, such as an AIR bypass solenoid, in this multi-component circuit will not be detected by a PCM output driver circuit, yet it will create DTC P0411.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All - GO to PINPOINT TEST HM: SECONDARY AIR INJECTION (AIR) SYSTEM Step 17. GO to PINPOINT TEST HM: SECONDARY AIR INJECTION (AIR) SYSTEM Step 17.
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