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The 2015 Ford Focus purge valve sits on the EVAP canister by the back of the car close to the fuel tank. Some signs of a faulty valve include rough idling, starting issues, and the check engine light coming on. This valve regulates the fuel vapor expelled from the charcoal canister, controlled by the ECU. Replacing the valve can cost between $120 to $200, with parts ranging from $80 to $150. The repair job isn't too complex and should be fairly straightforward for someone skilled in working with cars and engines.
The 2015 Ford Focus has its purge valve positioned in the evap canister, situated above the back of the muffler.