For Shop Owners

P0177 - Fuel Composition Sensor Circuit Range/Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Flexible Fuel (FF) sensor to Vehicle Power (VPWR) circuit harness open or shorted
  • FF to VPWR circuit poor electrical connection
  • Open in FF sensor signal circuit
  • Short to ground in FF sensor signal circuit
  • Fuel contamination
What does this mean?

Tech notes

Replaced Fuel Composition Sensor
What does this mean?

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0177 Description

Fuel Composition Sensors are used to determine the amount of ethanol alcohol in the gasoline. Normally, a gasoline engine should not have more than 10% ethanol alcohol in the fuel for proper operation. Some vehicles have a Flexible Fuel (FF) system on them that allow them to run on up to 85% ethanol alcohol in the fuel. The fuel composition sensor sends a frequency modulated signal to the engine controller which is proportional to the alcohol content of the fuel. The injector pulse width and the ignition timing are modified for the increased alcohol content. It takes almost twice the amount of alcohol compared to gasoline to produce the same power.
OBDII Code P0177 - Fuel Composition Sensor Circuit Range/Performance -

P0177 Information for specific makes

P0177 MERCEDES-BENZ Fuel Composition Sensor Circuit Range/Performance

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P0177 Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 06-14-2015

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