P0176 - Fuel Composition Sensor Circuit
Some vehicles may run on a mixture of different fuels and the ECM will use a sensor to check that the mixture of the fuels is at the correct ratio
Fault Code Explained
The ECM has detected that the sensor output is incorrect due to an undefined reason. The sensor value could be outside of its normal operating parameters or not reading as expected for the current engine operating conditions.
It is recommended to follow the manufacturers recommended test plan when diagnosing this fault code