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Focus Cetec Climate Help needed for error - reduced acceleration

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Hello I have had my ford focus checked because an engine malfunction light came on and the esp light will not go out, code P2121 came up as a fault code it reads out as throttle/pedal,   position sensor/switch D circuit, range/performance.

I tried to get rid of the problem myself by changing the throttle pedal and I also changed the sensor on the throttle body. I thought one of these would do the job. Obviously there is a fault somewhere and that is why the car is in link mode still. Can anybody help?


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