Question

Got codes on a 2010 Nissan Altima, P0441 & P0455 what do they mean?

Answer 1

The P0455 is for a gross evap leak. This can be something like a loose or missing gas cap. The P0441 is for the purge control solenoid. If this is stuck open, it will generate the code for the gross evap leak. These are related and the purge control solenoid needs to be inspected.

Answer 2

P0441 NISSAN - Evaporative Control System Incorrect Purge Flow
Read more: https://www.autocodes.com/p0441_nissan.html

P0455 NISSAN - EVAP Control System Gross Leak Detected
Read more: https://www.autocodes.com/p0455_nissan.html