p0456
Easy Fix
SEAT · SUVs & Crossovers
Evaporative Emission Control System Leak Detected (Small)
Quick Answer
Error code P0456 on your SEAT SUVs & Crossovers means: Evaporative Emission Control System Leak Detected (Small). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Inspect the fuel tank cap seal for damage and proper fit
2
Check all fuel vapor hoses for cracks or disconnection
3
Perform a fuel system pressure leak test using a scan tool
4
Inspect the fuel tank pressure sensor and hose for leaks
5
Replace the fuel tank cap or tighten connections as necessary
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 tank cap
Fuel vapor hoses
Fuel tank pressure sensor
Purge solenoid valve
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