P0447 NISSAN - only comes on after 3 or 4 weeks after being reset

Question

fault code po447 whwn service engine light comes on, already replaced cannister, normally lasts about 3 weeks after code is reset

Answer 1

Hi there

This code is for the vent control valve on the canister. It takes that long for the light to come on because the car has to run the self test and see a fault 2 times before it's going to turn the light on. The vent control valve is a common issue on these.