What do the following fauilt codes mean P1517 and P0221 on Citroen Picasso 2.0 d?

Fault code P1517 on a Citroen Picasso 2.0 D typically indicates an issue with the throttle position sensor or its circuit, which can affect engine performance and responsiveness. Code P0221 generally points to a malfunction in the throttle/pedal position sensor/switch "B" circuit, often related to improper voltage signals. Both codes suggest problems with the throttle control system that may require inspection or replacement of the affected sensors.