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Firstly, you will need an On Board Diagnostics (OBD) scanner to verify the fault code P0026. Follow your scanners instructions to verify the fault. My scanner advised me that I had a Intake Valve Control Solenoid Circuit Range/Performance (Bank1) Fault.
I recommend doing some web searches of the fault code to get an understanding of what the fault affects and also other possible causes. If you are satisfied that the fault is being caused by solenoid or switch then proceed with this guide.