my Vauxhall Zafira 1.6 MK2

Hi i have these on my code reader i was wonder if it was a cheap fix
po135- 02 sensor heater circuit bank 1 sensor 1,
p0141-02 sensor heater circuit bank 1 sensor 2,
p0443- evaporate emission system purge circuit control valve circuit

i dont know what po443 means