why does my BMW X3 F25 (2011-2018) jerk when shifting gears

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, transmission fluid, funnel, torque wrench, multimeter.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission fluid dipstick and check the fluid level.
  2. If low, add the appropriate type of transmission fluid as specified in the owner’s manual.
  3. If the fluid is dark or has a burnt smell, drain the old fluid.
  4. Use a socket set to remove the transmission pan bolts and the pan itself.
  5. Clean the transmission pan and replace the filter if applicable.
  6. Reinstall the pan with a new gasket and torque the bolts to the manufacturer’s specifications.

3. Inspect and Replace Transmission Mount

• Sub-steps:
  1. Locate the transmission mount and visually inspect it for cracks or damage.
  2. Use a socket set to remove the mounting bolts.
  3. Replace the mount with a new one, ensuring proper alignment.
  4. Torque the mounting bolts to the specified values.

4. Test and Replace Throttle Position Sensor (if necessary)

• Sub-steps:
  1. Disconnect the electrical connector from the TPS.
  2. Use a multimeter to check the TPS voltage (should vary smoothly as the throttle is opened).
  3. If out of range, remove the TPS and replace it with a new unit.
  4. Reconnect the electrical connector.