P0171 on MERCEDES-BENZ C-CLASS
What P0171 Means on Your MERCEDES-BENZ C-CLASS
Real MERCEDES-BENZ C-CLASS Owner Reports (Source: NHTSA Complaints Database)
"Very strong fuel odor inside cabin of vehicle while driving. odor is very strong around drivers rear wheel and from the outside once parked. also noticed gasoline/fuel accumulation underneath vehicle around driver's side rear, on under body panels."
"1.What component or system failed or malfunctioned, and is it available for inspection upon request? The fuel system failure is a highly critical safety concern, and my life is at risk."
Data from NHTSA Vehicle Complaints Database. All reports are filed by vehicle owners directly with the U.S. Department of Transportation.
Common Causes of P0171 on MERCEDES-BENZ C-CLASS
Percentages based on NHTSA complaint component analysis for this vehicle.
Complaint Trend by Year
What To Do Next
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1
Check for recalls on YOUR VIN
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if your vehicle is covered.
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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.