Ford Code P0471 is an exhaust pressure (EP) sensor code that indicates a problem with the circuit range or performance of the sensor. This code is often set when the exhaust pressure sensor signal is not within the calibrated value, or when the EP sensor reading is less than the barometric pressure sensor reading. To diagnose the issue, it is essential to make sure the EP sensor is installed correctly, and the EP tube is not restricted. The two related service bulletins, 18-2324 and 19-2257, provide further information about this code and its causes and solutions. Knowing how to diagnose and address this code is essential for anyone who owns a Ford vehicle, as it can help prevent further damage.
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Causes and Solutions for Ford Code P0471
| Cause | Solution |
|---|---|
| Restricted EP supply tube | Check the tube for blockages and/or restrictions |
| Damaged EP sensor | Replace the EP sensor |
| Incorrectly installed EP sensor | Check the installation of the EP sensor |
| Low voltage to the EP sensor | Check for poor wiring connection to the EP sensor |
Restricted EP Supply Tube
One of the most common causes of Ford Code P0471 is a restricted exhaust pressure (EP) supply tube. A blocked or restricted EP tube can cause the EP sensor to read lower than it should, resulting in false readings. To diagnose this issue, checking the EP tube for blockages and/or restrictions is essential. If the tube is blocked, it should be cleared or replaced.
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Damaged EP Sensor
Another possible cause of Ford Code P0471 is a damaged exhaust pressure (EP) sensor. If the sensor is malfunctioning, it can cause the EP sensor to read lower than it should, resulting in false readings. To diagnose this issue, it is essential to check for any damage to the EP sensor. If the sensor is damaged, it should be replaced.
Incorrectly Installed EP Sensor
Yet another possible cause of Ford Code P0471 is an incorrectly installed exhaust pressure (EP) sensor. If the sensor is installed incorrectly, it can cause the EP sensor to read lower than it should, resulting in false readings. To diagnose this issue, it is essential to check the installation of the EP sensor. If the sensor is not installed correctly, it should be reinstalled.
Low Voltage to the EP Sensor
The final possible cause of Ford Code P0471 is a low voltage to the exhaust pressure (EP) sensor. If the voltage is too low, it can cause the EP sensor to read lower than it should, resulting in false readings. To diagnose this issue, checking for any poor wiring connection to the EP sensor is essential. If the connection is poor, it should be repaired or replaced.
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Conclusion
Ford Code P0471 is an exhaust pressure (EP) sensor code that indicates a problem with the circuit range or performance of the sensor. Knowing the common causes and solutions for this code is essential for anyone who owns a Ford vehicle, as it can help prevent further damage. The four most common causes are a restricted EP supply tube, a damaged EP sensor, an incorrectly installed EP sensor, and a low voltage to the EP sensor. To diagnose and address Ford Code P0471, it is essential to check the EP tube for blockages and/or restrictions, replace the EP sensor if it is damaged, check the installation of the EP sensor, and check for poor wiring connection to the EP sensor.
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