P0176 Code - Fuel Composition Sensor Circuit Malfunction

What Does P0176 Mean?

OBD-II Code P0176 is defined as a Fuel Composition Sensor Circuit

vehicle's that are capable of running off of varying levels of ethanol (Flex Fuel, E85), will have a Fuel Composition Sensor in the fuel system so that the engine control module (PCM) can determine the fuel composition and adjust the fuel delivery accordingly. When the PCM detects an incorrect signal from the Fuel Composition Sensor, the PCM will set code P0176.

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What are the common causes of P0176 ?

• Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
• Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
• An air leak forward of the DPF will change the sensor readings resulting in the code

What are the symptoms of P0176 ?

These may vary from none at all to a severe engine misfire, hesitation, sag, or stumble on acceleration, or a no start condition. Other fuel system codes may also be stored in addition to this code.

How do you troubleshoot P0176 ?

• Exchanging of contaminated or incorrect fuel
• Replacing a faulty flex fuel sensor
• Repairing an open or short in the flex fuel sensor circuit
• Replacing a faulty ECM
• Replacing a damaged or pinched flex fuel sensor line

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