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 Key Battery in the Mercedes SL Roadster R129

Model: Mercedes Sl MK 5, R129 - Years 1989-2001
Part: Key

Inside the key of your Mercedes SL Roadster R129, there are four small button batteries. However, replacing them is quite simple and quick. Let's see how to do it. First, remove the back cover to gain access to the batteries. Next, take out the old batteries and proceed with the actual replacement by installing the new batteries. Once done, reattach the back cover correctly, and you're finished. Finally, test the key to ensure it works.

Updated on 28 May 2026 by ScegliAuto

Video tutorial

Related tutorials

How to Remove the Door Panel on a Mercedes SL R129?
How to Remove the Door Panel on a Mercedes SL R129?
Mercedes Sl (1989-2001 / MK 5, R129) This video explains how to remove the door panel on the second version of the Mercedes SL, identified by the code R129. Start by removing the metal t…
How to Remove the Radio and Center Console of the Mercedes R129
How to Remove the Radio and Center Console of the Mercedes R129
Mercedes Sl (1989-2001 / MK 5, R129) Let's see how to remove the radio from the center console of this Mercedes R129: insert the special keys into the designated holes to allow the radio…
How to Replace the Hydraulic Cylinder of the Convertible Top on a Mercedes SL?
How to Replace the Hydraulic Cylinder of the Convertible Top on a Mercedes SL?
Mercedes Sl (1989-2001 / MK 5, R129) To replace the hydraulic cylinder of the convertible top on a Mercedes SL, tilt the front seat backs forward and remove the carpet located in the rea…

Other guides you may be interested in

How to Reset the Tyre Pressure Light on the Opel Grandland X

While driving, if you notice the tyre pressure warning light coming on, first check the actual inflation pressure of the tyres and, if necessary, restore the pressures recommended by the manufacturer. After restoring the correct pressures, you need to reset the warning light that has illuminated on the instrument cluster. To do this, locate the reset button on the lower central console. Press this button and hold it down for at least 3 seconds, after which the low pressure indication will turn off.

Watch the video!


by ScegliAuto

More videos