P0442 on a Nissan: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

Safe to drive — this is a small emissions-system leak, not an engine problem. Fix it before your next emissions test.

What P0442 means on a Nissan

On a Nissan, P0442 means the EVAP system, which captures fuel vapors from the tank, has a small leak. The engine runs fine, so the check engine light is usually the only symptom. It's an emissions issue, not a drivability issue.

Is P0442 common on Nissans?

P0442 shows up on Nissans like the Altima, Rogue, Sentra, and Pathfinder, most often as the gas cap seal and EVAP hoses age. A loose or worn gas cap is the most common cause, followed by small cracks in EVAP hoses and faulty vent or purge valves. It's a common code on higher-mileage Nissans.

Commonly reported on: Altima, Rogue, Sentra, Pathfinder.

Symptoms

Check engine light is on
Possible faint fuel smell
Usually no driving symptoms

Common causes

most common: Loose, missing, or damaged gas cap
common: Small leak in an EVAP hose or fitting
common: Faulty EVAP purge or vent valve
less common: Small crack in the charcoal canister

How to fix it

Fix	DIY?	Typical cost
Tighten or replace the gas cap	Yes	$10–30
Inspect and replace cracked EVAP hoses	Yes	$15–80
Have a smoke test performed to find the exact leak	Mechanic	$50–150
Replace a faulty purge or vent valve	Yes	$40–160