P0456 on MERCEDES-BENZ E-CLASS
EVAP System Leak Detected (very small leak)
Methodology: Reviewed against the SAE J2012 generic DTC definition and NHTSA owner-complaint patterns, then scoped to Mercedes Benz E Class context without treating complaints as confirmed diagnoses.
Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).
- SAE J2012 Diagnostic Trouble Code Definitions — Generic diagnostic trouble code definition reference for P0456.
- NHTSA recalls, complaints, and manufacturer communications — Used to check public owner complaint context, recall status, and safety-related manufacturer communications by VIN or vehicle.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
What P0456 Means on Your MERCEDES-BENZ E-CLASS
P0456 is a diagnostic trouble code indicating: EVAP System Leak Detected (very small leak). This code relates to the powertrain, fuel, ignition, emissions, or air-management system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.
Real MERCEDES-BENZ E-CLASS Owner Reports
Source: NHTSA Complaints Database
"Check engine light illuminated, code scan revealed code p0456. inspection reveals fuel leakage at both the left fuel sender and the right fuel pump housings. liquid fuel is externally evident along with the associated smell of raw fuel vapor."
"Check engine light comes on shortly after fill up of gasoline. light goes out when tank is about 1/2. repeats at next fill up. check engine code is p0456: evap system very small leak."
"There was a very strong fuel smell that began 8 months ago every time i parked the car in the garage. it was almost like someone spilled some gasoline on the floor. a month ago the check engine light came on and indicated a p0456 error code on the obdii reader."
"Bought a used 2007 mercedes benz e350 mar 14, 2011 drove less than 80 miles before check engine light came on because of code p0456."
All reports filed by vehicle owners directly with the U.S. Department of Transportation.
📊 Complaint Trend by Model Year
Common Causes on MERCEDES-BENZ E-CLASS
Based on NHTSA complaint component analysis for this vehicle.
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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2
Get a proper diagnosis
A code alone doesn't tell you the exact failed part. A diagnostic at a shop ($50–$150) pinpoints the root cause before you spend money on parts.
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3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.