When the fuel gauge is not working in Your Mazda CX-9 that is usually a sign of a bad fuel level sensor. This is a sensor that is located in Your gas tank and is designed to measure the level of gasoline in the tank using a float. If this sensor fails it will not send the information to Your ECU and that will lead to the gauge not working properly. I recommend using an OBD II scan tool on Your car to see if the ECU has reported any faults or communication issues with the fuel level sensor. If it has then You will need to replace the sensor with a new one to get it working again.
Hi there how do I fix my fuel gauge on my 2012 cx9 as it's reading full all the time..
Evelyn F
July 30, 2020
The Mazda cx 9 may experience inaccurate fuel gauge readings if the fuel pump, fuel level sensor or tank float are faulty.
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