p0456
Easy Fix
Porsche · Sedans & Sports Cars
Evaporative Emission System Leak Detected (Small Leak)
Quick Answer
Error code P0456 on your Porsche Sedans & Sports Cars means: Evaporative Emission System Leak Detected (Small Leak). 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 and replace fuel cap if damaged
2
Visually check all EVAP hoses for small cracks or pinhole leaks
3
Perform a smoke test with low pressure to pinpoint leak location
4
Check charcoal canister for small cracks
5
Inspect purge valve hose connections
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
EVAP hoses
Purge control valve
Charcoal canister
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