Ford Focus “Tire Sensors Not Detected. See Manual” Warning
Ford Focus users who encounter the “Tire sensors not detected. See manual.” warning are experiencing a communication issue related to the vehicle’s TPMS (Tire Pressure Monitoring System). This warning can be caused by various issues, ranging from sensor failures to system calibration errors.
How Does the TPMS System Work?
In Ford Focus models, the TPMS measures air pressure through sensors located in each tire and transmits this information to the vehicle’s main computer (ECU). If one of the sensors fails to send a signal or the control module cannot process this information, the system cannot detect the sensor and issues a warning.
Primary Causes of the Warning
1. Sensor Battery is Dead or Weak
TPMS sensors have internal batteries that last between 5–10 years. When the battery dies, the sensor cannot transmit data, and the system fails to detect the sensor.
2. Calibration Not Performed After Tire Replacement
The system must be recalibrated after tire or wheel changes. Otherwise, the vehicle attempts to read the old sensor locations, resulting in an error.
3. Physical Damage to the Sensor
The valve or sensor can be broken during tire mounting/dismounting procedures. In this case, the sensor must be completely replaced.
4. Receiver Module Failure
The problem may sometimes lie not with the sensor, but with the vehicle’s receiver module that collects the signals. In this situation, an electronic check should be performed by the service center.
5. Use of Incompatible Sensors
There are different TPMS protocols on the market. If sensors incompatible with the Ford Focus are used, the system will display the “not detected” warning.
What to Do When the Warning Appears
1. Manually Check Tire Pressures
Even if the system fails to detect the sensor, your tires may have lost pressure. Check all tires according to manufacturer specifications.
2. Perform a TPMS Reset via the Vehicle Menu
Some Focus models offer the user a TPMS reset option. The reset should be performed after checking the pressures.
3. Have the Sensors Tested
At the service center, a sensor scanning device is used to check if the sensors are transmitting a signal, and the faulty sensor is easily identified.
4. Sensor Replacement
Broken, damaged, or end-of-life sensors must be replaced with new ones. Calibration is mandatory after replacement.
5. Electronic System Check
If the problem occurs simultaneously across all sensors, it may be a receiver module failure. A service check is essential.
Importance for Driving Safety
The TPMS provides critical warnings regarding tire pressure. Ignoring this warning can lead to sudden pressure loss, tire blowouts, and handling issues.
Frequently Asked Questions (FAQ)
What is the Ford Focus “Tire sensors not detected” error?
This error occurs because the TPMS system is not receiving a signal from one or more tire sensors. The sensor battery may be dead, the sensor may be faulty, or there may be a vehicle calibration error.
How do I reset the TPMS sensor?
The Ford Focus menu contains a “TPMS Reset” or “Tire Pressure Reset” section. After correcting the pressures, the reset must be performed via the menu.
What is the sensor battery life?
TPMS sensors typically operate for 5–10 years. When the battery dies, the sensor is replaced entirely.
Why does a sensor fault occur during tire replacement?
The sensor or valve may break during tire mounting/dismounting. Additionally, the sensor may not be detected if the system is not recalibrated after the tire change.
Is it safe to continue driving with the warning?
No. If the TPMS is not working, you may not notice sudden drops in tire pressure. This compromises driving safety.
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