astra sport 1.6 twinport eml

hi all had eml light come on and car went into limp mode,rac came out and their computer said it was accellerator pedal sensor.i fitted a new one but still have same problem. I did the pedal test and two faults came up ,p1122 and p1550.
rac also checked throttle body which was fine. anybody got any idea whats wrong many thanks.