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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36056
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Ford Focus SEL: Fault codes P0491 and P0410 (secondary air

Customer Question

Fault codes P0491 and P0410 (secondary air pump). How do I diagnose and fix the problem?
Submitted: 2 years ago.
Category: Ford
Expert:  Ron replied 2 years ago.
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
The problem you are describing as well as the codes can be caused by any of the following,
Restricted Air Pump Hoses
Failed Air Pump Relay
Open Air Pump Relay Circuit
Defective AIR Switching Valve
Leaking Exhaust System
In order to determine the cause you are going to need to do some testing, See the steps in the link below to do so. Copy and paste the link to your browser to open and view them.
Customer: replied 2 years ago.
Hello Ron. Thanks for your answer. Can I have diagram/schematic of the main parts I'm going to be checking on. I want to make sure I know where to locate what I'm looking for under the hood.
Expert:  Ron replied 2 years ago.
See the air pump location in the link below.
Customer: replied 2 years ago.
Ron, the links you sent don't work. I get a Dropbox "Error (404)" message saying that the page does not exist.
Expert:  Ron replied 2 years ago.
See the link below, be sure to print them out as they will expire over time.
Please take a moment to rate my service so I can get credit for my time, the question remains open for follow up even after doing so, all you need to do is return to this question if need be.
Thank you again.