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P0176 is a diagnostic trouble code (DTC) for "Fuel Composition Sensor Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Fuel Composition Sensor Circuit Malfunction
Trouble code P0176 is triggered by the Engine Control Module (ECM) when it receives an abnormal signal from the flex fuel sensor.
The flex fuel sensor is designed to measure the amount of ethanol present in the gasoline of a flexible-fuel vehicle (FFV); some ethanol is added to the gasoline because it is a renewable resource, and it burns off less pollutants. The flex fuel sensor sends a signal to the ECM in correlation with the amount of ethanol present, then the ECM adjusts the ignition timing and fuel injector pulse width accordingly.
Not checking for fuel flow restrictions
May cause the engine to stall, which may leave you stranded or having to wait for assistance
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