mike mike

i have an 2008 audi a4 quatrro 2.0t it threw a code p0221 it went into limp mode the epc light came on also along with the traction control light i looked it up and it said. throttle / pedal position sensor/switch b circuit range/performance. id like to try to fix it myself i just dont know if i need to change the throttle or clean it or if its something else i could use your help if you have any insight on this. thank you