ODBII codes P1633 & P0221 on a 2002 330Ci

[dooosuk]

Driving in this morning I got the engine warning light, EML, DSC and handbrake warning lights flash up as I pulled away from a junction. After stopping and starting the car, all lights except the engine warning light went out. I've just borrowed an ODBII code reader and have retrieved the following info:

SAE Code P1633
DTC Code 18041
Description Accelerator Pedal Position Sensor 2 Signal too Low

SAE Code P0221
DTC Code 16605
Description Throttle Position Sensor -B- Circuit Range/Performance


Any ideas on where I go from here? What to check/look for?

Thanks
Andy