Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

How to Replace the Transfer Case Gear on the BMW X3

Model: BMW X3 E83, MK 1 - Years: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Part: Transmission

See other generations:
Video tutorial

If you feel jerking, especially during startup or acceleration, and the 4x4 warning light illuminates on the dashboard, there is likely a problem with the transfer case. This is a common issue with this model because the motor that operates the transfer case has a plastic gear that tends to deteriorate.

The definitive solution is not to install a new motor but to replace the original gear with a rebuilt brass one, which is readily available in the aftermarket. The replacement is straightforward: remove the motor from the transfer case (it is very similar to a window lift motor), drill a small hole to remove the cover, the oil seal, and the retaining circlip of the old gear, then install the new one, making sure to apply gear grease and seal the hole.

It is also recommended to replace the transfer case oil and reset the clutches using appropriate diagnostic equipment.


Updated on 26 February 2026 by ScegliAuto


Related tutorials

Guide to Repair the Transfer Case on the BMW X3 - X5
Guide to Repair the Transfer Case on the BMW X3 - X5
BMW X3 (2003-2010 / E83, MK 1) In this brief guide, you will see the main steps to disassemble and repair the transfer case on the first-generation BMW X3, as well as the X5. First…
Transfer Case Oil Replacement
Transfer Case Oil Replacement
BMW X3 (2003-2010 / E83, MK 1) If during acceleration the vehicle tends to jerk and the 4x4 and traction control warning lights illuminate on the dashboard, it is likely that the t…
How to Replace the Transfer Case Motor on a BMW X3
BMW X3 (2003-2010 / E83, MK 1) Here’s how to remove and replace the transfer case motor on a BMW X3: Lift the vehicle on a column lift, locate the transfer case as shown in the vid…

How to Reset the Tyre Pressure Warning Light on a Kia Rio?

The tyre pressure warning light displayed on the instrument cluster of the Kia Rio can be reset by inflating the tyres until they reach the recommended pressure value: this value is indicated on the sticker affixed to the driver's door pillar. Once all tyres have been inflated to the recommended pressure, turn on the ignition to check that the light has disappeared: if it is still present, it may be necessary to drive for a few miles, allowing the sensors to work and thus turning off the light.

Watch the video!


by ScegliAuto

More videos