TPMS Sensor

Replace or reprogram a tire pressure monitoring system (TPMS) sensor on a 2009 Aston Martin DB9, including wheel removal, sensor replacement, and system relearn.

Warnings

Tools required

Parts

• TPMS sensor × 1 — Use OEM specification or compatible 433 MHz sensor
• TPMS valve stem service kit × 1 — Includes valve core, cap, and seal

Preparation

1. Park vehicle on level ground and engage parking brake.
2. Place wheel chocks behind the wheels that will remain on the ground.
3. Identify which wheel has the faulty TPMS sensor using the vehicle's display or a TPMS scan tool.
4. Loosen wheel lug bolts approximately one full turn before lifting vehicle.
5. Lift vehicle at appropriate jacking point and secure with jack stands.

Procedure

1. 1

   Remove wheel
   Remove the wheel lug bolts completely and remove the wheel from the hub. Set wheel aside with tire face up to protect the finish.
2. 2

   Deflate tire completely
   Remove the valve stem cap and deflate the tire completely by depressing the valve core. If equipped with a valve core removal tool, remove the core entirely for faster deflation. This prepares the tire for bead breaking and demounting.
3. 3

   Break tire bead and demount tire
   Using a tire changer or manual bead breaker, break both tire beads away from the wheel rim. Carefully demount the tire from the wheel, taking care not to damage the wheel finish or the TPMS sensor mounted inside the rim. Apply tire bead lubricant if needed to ease removal.
4. 4

   Locate and remove TPMS sensor
   Locate the TPMS sensor mounted to the valve stem on the inside of the wheel. The sensor is typically secured with a hex nut at the valve stem base. Remove the retaining nut and carefully extract the sensor and valve stem assembly from the wheel. Note the orientation and position for installation of the new sensor.
5. 5

   Install new TPMS sensor
   Insert the new TPMS sensor valve stem through the valve hole in the wheel from the inside. Install the new valve stem seal (from service kit) and thread the retaining nut onto the valve stem. Tighten the retaining nut to the sensor manufacturer's specified torque (typically around 35-62 in-lb — verify for this sensor), ensuring the sensor body is positioned away from the tire bead seating area to prevent damage during tire mounting. Note: Torque the valve stem nut to the sensor manufacturer's specification (commonly ~35-44 in-lb; verify for the specific sensor used)
6. 6

   Mount tire and inflate
   Apply tire bead lubricant to both tire beads. Carefully mount the tire onto the wheel, ensuring the TPMS sensor is not contacted or damaged by tire mounting tools. Seat both beads onto the rim and install the valve core. Inflate the tire to the specified pressure shown on the driver's door jamb placard for your specific vehicle. Note: Inflate the tire to the specified pressure listed in the Aston Martin owner's handbook / placard for your specific vehicle (verify the exact front and rear pressures before inflating). Note: Inflate the tire to the specified pressure shown on the driver's door jamb placard or owner's manual for your specific DB9 (do not rely on assumed values — always use the vehicle-specific placard).
7. 7

   Balance wheel assembly
   Balance the wheel and tire assembly on a wheel balancer. Apply wheel weights as needed to achieve proper balance. This step is essential to prevent vibration and premature tire wear.
8. 8

   Reinstall wheel
   Place the wheel back onto the hub, aligning the bolt holes. Thread all wheel lug bolts by hand to prevent cross-threading. Tighten lug bolts in a star pattern to seat the wheel properly.
9. 9

   Torque wheel lug bolts
   Lower the vehicle until the wheel just contacts the ground but still allows rotation. Using a torque wrench, tighten the wheel lug bolts to the manufacturer specification (verify against Aston Martin workshop manual; DB9 wheel bolt torque is commonly approximately 150 Nm / 111 ft-lb) in a star pattern. Fully lower the vehicle and perform a final torque check at the same specification. Note: Using a torque wrench, tighten the wheel lug bolts in a star pattern to the manufacturer specification (verify exact value against Aston Martin service documentation). Fully lower the vehicle and perform a final torque check. Note: Using a torque wrench, tighten the wheel lug bolts to the manufacturer-specified torque (verify against Aston Martin service documentation; approximately 100 ft-lb / 135 Nm) in a star pattern. Fully lower the vehicle and perform a final torque check at the same specification. Note: 111 ft-lb (150 Nm) — verify against Aston Martin service documentation
10. 10

    Program and relearn TPMS sensor
    Connect the TPMS scan tool as directed by the tool's Aston Martin coverage. Verify whether the DB9 relearn is performed via the OBD-II port (located under the driver's side dashboard) or by a dedicated trigger/relearn procedure before proceeding. Follow the tool's prompts to enter TPMS programming mode. Trigger or program the new sensor using the scan tool, ensuring it is recognized by the vehicle's TPMS control module. Perform the TPMS relearn procedure as directed by the scan tool, which for the DB9 typically requires programming/triggering each sensor with the tool to register its ID in the TPMS control module (verify the exact relearn method in Aston Martin service documentation). Note: Register or relearn the new sensor using the appropriate method for the DB9 TPMS system, which may use an auto-relearn drive cycle (driving above ~20 mph for several minutes) and/or a compatible TPMS tool. Verify the correct relearn procedure against Aston Martin service documentation, as the OBD-II programming method may not apply to this vehicle. Note: Perform the TPMS relearn procedure as directed by the scan tool. Note that the 2009 DB9 typically requires registering the new sensor ID using a compatible TPMS tool; verify the exact relearn method (tool registration vs. auto-relearn drive cycle) against Aston Martin service documentation before relying on a drive cycle alone.
11. 11

    Clear fault codes and verify system operation
    Using the TPMS scan tool, clear any stored TPMS fault codes from the vehicle's system. Start the vehicle and verify that the TPMS warning light on the instrument cluster extinguishes after a few seconds. Check the tire pressure display to confirm the new sensor is transmitting data correctly and showing the proper tire pressure.

Reassembly

1. Reassembly is included in the procedure steps above.
2. Ensure all tire pressures are set to the specifications on the driver's door jamb placard.
3. Verify the TPMS warning light does not remain illuminated after system relearn.

Verification

• Start the vehicle and confirm the TPMS warning light extinguishes within a few seconds of engine start.
• Check the tire pressure display on the instrument cluster to verify all four tire pressures are displayed correctly.
• Drive the vehicle for 5-10 minutes above 20 mph to ensure the TPMS system continuously receives signals from all sensors.
• Use the TPMS scan tool to verify the new sensor ID is stored in the vehicle's TPMS control module and transmitting properly.
• Inspect the repaired wheel for proper tire seating and no air leaks at the valve stem.

More procedures for this vehicle