P0456 on MERCEDES-BENZ E-CLASS — EVAP System Leak Detected (very small leak)

Q: "What does P0456 mean on a MERCEDES-BENZ E-CLASS?"

"P0456 indicates: EVAP System Leak Detected (very small leak). This is a emission controls code. 4 MERCEDES-BENZ E-CLASS owners have reported this to NHTSA."

Q: "What are the most common causes of P0456 on MERCEDES-BENZ E-CLASS?"

"Based on 4 NHTSA reports, the most commonly cited components are: Fuel System, Gasoline, Engine,Fuel/Propulsion System. These percentages are based on the component field in owner complaints."

Q: "Is P0456 serious on my MERCEDES-BENZ E-CLASS?"

"Of 4 NHTSA reports for this code on MERCEDES-BENZ E-CLASS, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic."

Q: "What should I do if my MERCEDES-BENZ E-CLASS shows P0456?"

"1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare."

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 emission controls system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

4 MERCEDES-BENZ E-CLASS owners have reported this issue to NHTSA across model years 2005-2007. Most reports come from the 2007, 2005 model years. The most commonly reported component is Fuel System, Gasoline (75.0% of reports).

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."

— 2005 MERCEDES-BENZ E-CLASS owner · FUEL SYSTEM, GASOLINE · Filed 12/13/2014

"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."

— 2006 MERCEDES-BENZ E-CLASS owner · ENGINE,FUEL/PROPULSION SYSTEM · Filed 08/01/2014

"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."

— 2007 MERCEDES-BENZ E-CLASS owner · FUEL SYSTEM, GASOLINE · Filed 10/01/2013

"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."

— 2007 MERCEDES-BENZ E-CLASS owner · FUEL SYSTEM, GASOLINE · Filed 04/05/2011

All reports filed by vehicle owners directly with the U.S. Department of Transportation.

📊 Complaint Trend by Model Year

1

'05

1

'06

2

'07

Common Causes on MERCEDES-BENZ E-CLASS

Based on NHTSA complaint component analysis for this vehicle.

FUEL SYSTEM, GASOLINE 75%

ENGINE,FUEL/PROPULSION SYSTEM 25%

What To Do Next

1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. If your vehicle is covered, repairs are free.
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.
3
Compare repair quotes
Get 2–3 quotes. Dealer vs. independent shop prices often differ 30–50% for the same repair.

Frequently Asked Questions

What does P0456 mean on a MERCEDES-BENZ E-CLASS? ▾

P0456 indicates: EVAP System Leak Detected (very small leak). This is a emission controls code. 4 MERCEDES-BENZ E-CLASS owners have reported this to NHTSA.

What are the most common causes of P0456 on MERCEDES-BENZ E-CLASS? ▾

Based on 4 NHTSA reports, the most commonly cited components are: Fuel System, Gasoline, Engine,Fuel/Propulsion System. These percentages are based on the component field in owner complaints.

Is P0456 serious on my MERCEDES-BENZ E-CLASS? ▾

Of 4 NHTSA reports for this code on MERCEDES-BENZ E-CLASS, none involved a crash or fire. However, any diagnostic code should be evaluated by a qualified mechanic.

What should I do if my MERCEDES-BENZ E-CLASS shows P0456? ▾

1) Check for recalls on your VIN at nhtsa.gov/recalls. 2) Get a professional diagnosis — a code alone doesn't identify the exact failed part. 3) Get 2-3 repair estimates to compare.