hey new here, going to post in the other section of the forum but felt like i might get some answered here also.

just purchased an 06 a8l last week and have an intermittent problem, sometimes my EPC light goes on along with the triangle with an exclamation mark, but if i just turn off the car and turn it back on it goes away. anyways scanned it today and got a P0221 code: throttle/ pedal position senesor

just wondering what might be the problem, thanks for anyone that can help me with this