p0456
Easy Fix
Nissan · Sedans
Evaporative Emission System Leak Detected (Small)
Quick Answer
Error code P0456 on your Nissan Sedans means: Evaporative Emission System Leak Detected (Small). This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Inspect fuel cap seal and replace if worn
2
Check all evap hoses for small cracks
3
Inspect fuel filler neck for damage
4
Test canister vent valve
5
Use smoke test for precise leak location
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
Fuel cap
Evaporative hoses
Fuel filler neck seal
Canister vent valve
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