P0449 on a Nissan: Causes, Fixes & Repair Cost
🟢 Low severity · drivable
Safe to drive — this is an emissions-system electrical fault — but fix it before an emissions test or a fuel smell appears.
What P0449 means on a Nissan
On a Nissan, P0449 means the engine computer sees an electrical fault in the circuit for the vent control valve on the EVAP canister near the fuel tank. The valve opens to let fresh air into the canister during a purge, and its connector and wiring sit low enough to corrode from water and salt.
Is P0449 common on Nissans?
P0449 appears on Nissan Altima, Sentra, and Rogue models, usually as the car ages or is driven in winter climates. A corroded connector and a faulty vent control valve are the typical causes on this brand.
Commonly reported on: Altima, Sentra, Rogue, Pathfinder.
Symptoms
- Check engine light is on
- Possible faint fuel smell
- No change in how the car drives
Common causes
- most common: Corroded or loose vent valve connector
- common: Faulty vent control valve
- common: Chafed or damaged wiring under the car
- less common: Damaged charcoal canister or valve assembly
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Clean and reseat the vent valve connector | Yes | $0–30 |
| Repair chafed or corroded wiring | Yes | $40–150 |
| Replace the vent control valve | Yes | $60–200 |
Frequently asked questions
Other common Nissan codes
P0449 on other brands
Looking for the full (non-brand-specific) guide? See the P0449 code page →
Browse all Nissan codes: Nissan hub →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.