CEL codes P0221 and C3721
 

Hey guys i got these codes last night. one is P0221- throttle/pedal position sensor/switch B circuit range/performance problem and C3721 which i have no idea wat that is. the car run smooth and ok? i have no idea wat the proeblm is can anybody help plz? i have no money to go to the dealer. i also got a pending code of c0700 which i have no idea either. i have a 05 mazda 6 V6