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Discussion Starter #1
Fuel Composition Sensor. Does anyone know where this sensor is located on a 2015 v6 Impala?

Thanks
Tom
 

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^ Bart77, did some older models determine the gas/alcohol percentages without being equipped with a fuel composition sensor?
 

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Yes. The 2011 and older models used the oxygen sensors and an algorithm to calculate the ethanol percentage instead of using a sensor like the 2012 and newer cars.

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Discussion Starter #8
FOUND IT! For future reference, Bart is correct, except on the 2015 Impala, the sensor is on the passenger side (right) just past the front seat.

Next question. Is the fuel line under pressure? If so, how do I relieve the pressure before I disconnect the lines from the sensor?

Thanks again
Tom
 

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I'm sure it is. Unless you have a shrader valve test port underhood or know which relay/fuse to pull to disable the fuel pump I wouldn't worry about it. Put on safety glasses and place an oil drain pan under the sensor and r&r it. Very little fuel should run out.
 
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