P0455 on a Nissan Altima
P0455 means evaporative Emission System Leak Detected (Large Leak). On the Altima, a few causes come up far more than others.
What P0455 usually means on a Altima
P0455 flags a large evaporative-system leak on the Altima. Beyond the gas cap, Nissan's EVAP components - the vent control valve and the purge volume control valve - are frequent offenders, and the vent valve can stick from corrosion. Fuel vapor is escaping rather than being captured. It will not affect driveability but will fail emissions.
Most common causes on the Altima
- Loose or worn gas cap
Still the first thing to check on any P0455.
- Stuck EVAP vent control valve
Nissan vent valves corrode and stick, leaving the system unable to seal - a common Altima cause.
- Failed purge volume control valve
A stuck-open purge valve leaks vapor and sets large-leak faults.
- Cracked EVAP hose
Aged lines near the tank and canister split and leak.
What P0455 costs to fix on a Altima
A gas cap is a fifteen-to-thirty-dollar first try. The Nissan vent control valve is a moderate part, often mounted near the charcoal canister at the rear of the car. Purge valve replacement is likewise moderate; a smoke test helps target the right component before buying parts.
Year, engine and mileage change the answer. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Nissan Altima
Related symptoms
Nissan Altima problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0455 behavior is covered on the main P0455 page. Confirm with a scan tool before buying parts.
P0455 on your Altima?
Every problem becomes a Case. Tell Redline what your Altima is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.