Question

2002 Nissan Altima, code P1448 and P0455. I have replaced the Gas Cap. What are the other possibilites for these codes?

P0455 | Evaporative Emission System Leak Detected (No Flow)
P1448 | 1. Vacuum Cut Valve 2. Vent Control Valve

Answer 1

Hi there,

Typically the issue is with the vent control valve. This is located on the charcoal canister. The VCBC can also cause issues, test the vent control valve by removing it and connecting a power and ground to it. If should then make a click type of sound. If not, replace it, if it does, then I suggest a smoke test to locate the source of the leak.

Answer 2

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

P1448 Nissan Code - EVAP Canister Vent Control Valve Open
Read more: https://www.autocodes.com/p1448_nissan.html