Low tire pressure sensor (Discovery 3)

Removal

NOTE: To prevent seal failure, it is strongly recommended that the valve seal and steel washer be replaced every time the tire is changed. The seal and washer should also be replaced when the sensor is removed. Removing the sensor mounting nut is considered as removing the sensor itself. The valve cap should always be on the valve, except when inflating the tire, releasing pressure, or checking the tire pressure.

1.

CAUTION: Never work on a vehicle supported only by a jack. Always support the vehicle with special stands.

Raise and support the vehicle.

2. Remove the wheel.

3.

CAUTION: To avoid damaging the low tire pressure sensor, begin removing the tire bead from the wheel rim 180 degrees from the valve.

Remove the tire from the rim.

4.

CAUTION: Avoid applying pressure to the valve.

CAUTION: If you are reinstalling an old low pressure tire sensor, you must replace the washer, seal and nut.

Remove the low tire pressure sensor.

• Unscrew the nut.
• Release the sensor and remove it parallel to the valve axis.

5. Install a new seal and washer if necessary.

• Remove and discard the old seal and washer.
• Install the new seal and washer, making sure the valve remains fully seated in its seat.

Installation

1.

CAUTION: Do not use compressed air to clean the sensor. Do not use any solvents or cleaning agents to clean the sensor. Clean the sensor with a dry, clean cloth.

Clean the contact surfaces of the parts.

2.

CAUTION: Do not apply any lubricant to the new sensor.

NOTE: If the sensor on the running wheel is replaced, the new sensor will be identified during the first drive of the vehicle. If the sensor on the spare wheel is replaced, the identification code of the new sensor must be programmed into the TPMS electronic unit using T4. The identification code is located on the label of the sensor kit packaging and is also imprinted on the shell of each sensor.

Install a low tire pressure sensor.

• Screw on and tighten the nut by hand, keeping the sensor still.
• Tighten the nut (tightening torque 6.5 Nm).

3. Mount the tire and balance the wheel.

4. Install the wheel. Tighten the wheel nuts. (tightening torque 140 Nm).