P0177Mercedes-benz E-classYears: 1996 - 2026
Fuel Composition Sensor Circuit Range/Performance
Reviewed by ASE Certified Technician
What does this mean?
Code P0177 indicates a problem with the fuel composition sensor circuit. This sensor is used in flex-fuel vehicles to determine the ethanol content of the fuel.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Mercedes-benz E-class models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
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Common Causes
Faulty fuel composition/flex fuel sensor
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Symptoms to Watch For
- Check Engine Light is illuminated
- Rough or unstable idle
- Difficulty starting the engine
- Decreased fuel economy
- Engine stalling or dying unexpectedly