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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 35506
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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My car just failed inspection due to check engine light,

Customer Question

Good morning Tim, My car just failed inspection due to check engine light, error codes P0410 and P0491. What is the best way to determine where the issue is and resolve? This car is almost 10 years old so I don't want to put too much money into it. I have a Ford Focus ZX4 SE 2006. Thank you for your help.
Submitted: 1 year ago.
Category: Ford
Expert:  Ron replied 1 year ago.

Hello and thank you for you question , the expert you have requested is not on line at the moment so I will help you with this issue, sorry for the delay.

The most common cause for the type of problem you are having is in most cases caused by a Air Induction Reaction (AIR) Switching Valve but can also be caused by any of the other followings things.

  • Restricted Air Pump Hoses
  • Failed Air Pump Relay
  • Open Air Pump Relay Circuit
  • Defective AIR Switching Valve
  • Leaking Exhaust System

    In order to determine if its the valve and or one of the other components you are going to need to some testing. I have enclosed the steps in the link below, copy and paste the link to your browser to open and view them.