P1448 Nissan -

Question

Have a 1999 nissan pathfinder, evap codes p0440 & p1448 keep coming on. I have replaced the charcoal canister & the vent control valve and still keeps coming back? All lines look good with no leaks. Whats to be done at this point?

Answer 1

HI there,

The next step has to be a smoke test to locate the source of the evap leak. It's leaking someplace or there is a problem with the evap pressure sensor. When these codes appear it's because the sensor voltage isn't changing.