Possible causes

– Faulty Fuel Level Sensor
– Fuel Level Sensor harness is open or shorted
– Fuel Level Sensor circuit poor electrical connection
– Faulty combination meter

Tech notes

There is a factory service bulletin for the following Mercury Models:

2003-2004 Mercury Grand Marquis
2003-2004 Mercury Grand Marquis Factory Service Bulletin OBDII Code P0460

When is the code detected?

Even though the vehicle is parked, a signal being varied is sent from the fuel level sensor to Engine Control Module (ECM).

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Fuel level gauge improper operation

P0460 MERCURY 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.

MERCURY Technical Service Bulletins for P0460 code