How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dan Your Own Question
Dan, Technician
Category: Ford
Satisfied Customers: 24458
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
Type Your Ford Question Here...
Dan is online now
A new question is answered every 9 seconds

1996 f150: 5.0l..p0411 secondary air injection system incorrect flow

Resolved Question:

1996 f150 5.0l code p0411 secondary air injection system incorrect flow,what is most likely wrong?
Submitted: 8 years ago.
Category: Ford
Expert:  Dan replied 8 years ago.
Potential Causes:

Air Pump
Bypass Valve
Control Solenoid - One or more may have a problem.
Diverter Valve
Vacuum Hoses



Check output air flow from air pump. Make sure both the bypass and diverter valves pump up and hold vacuum and that when vacuum is applied both valves switch position as they should. Check to see that solenoids apply vacuum when they are grounded. Check connections at both solenoids. Verify all of the vacuum hoses are in good shap, the air pump turns on, solenoids work, turbing to air pump has no leaks, and valves are working like they should. This should be a cheap repair but you may want to considering bringing vehicle into dealership and paying for a hour of labor so they can diagnose problem since they will be more familiar. Let me know if there is anything else I can do to help. Thanks




Dan and other Ford Specialists are ready to help you