Possible causes

– Faulty fuel level sensor
– Fuel level sensor harness is open or shorted
– Fuel level sensor circuit poor electrical connection

When is the code detected?

An excessively high voltage is sent from the sensor is sent to Engine Control Module (ECM).

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Incorrect fuel level reading

P0463 MAZDA Description

The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the Engine Control Module (ECM). The fuel level sensor consists of two parts, one is mechanical float and the other side is variable resistor. The fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

MAZDA Technical Service Bulletins for P0463 code