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Why does your miles per gallon reading on the overhead console computer stay same 1999 ford diesel same?

The miles per gallon (MPG) reading on your 1999 Ford diesel's overhead console computer may remain the same for several reasons:

1. Faulty Fuel Level Sensor: If the fuel level sensor in your vehicle is faulty or malfunctioning, it might provide incorrect fuel level readings to the computer. This could result in inconsistent or incorrect MPG calculations.

2. Faulty MPG Sensor: There might be an issue with the MPG sensor itself. Sensors can become damaged, worn out, or clogged over time, leading to inaccurate readings.

3. Electrical Issues: Electrical problems like loose or damaged wiring, poor connections, or a faulty computer module can disrupt communication between the MPG sensor and the overhead console computer, leading to incorrect or frozen MPG readings.

4. Software Glitches: Occasionally, software glitches or bugs in the vehicle's computer system can cause incorrect MPG readings, resulting in the MPG display remaining the same.

5. Resetting Process: In some cases, resetting the trip computer or disconnecting and reconnecting the battery might resolve temporary malfunctions and display the correct MPG readings again.

If you suspect any of these issues, it's recommended to have your vehicle diagnosed by a qualified mechanic or at an authorized Ford dealership. They can identify the root cause of the problem and perform the necessary repairs or replacements to get the MPG reading back to normal.