Cheap Mercedes-Benz SLK Central Locking Motor

Yes, the SLK is fitted with central locking motors as part of its central locking system, typically located in each door. The SLK was produced across three main generations: the R170 (1996–2004), the R171 (2004–2011), and the R172 (2011–2020), and all three generations used electric central locking motors. If your locking has stopped working on one or more doors, a failed motor is a common cause and used units are widely available from breakers.

These two cars sit in different generations — the R170 ran from 1996 to 2004 and the R171 from 2004 to 2011 — and the door designs changed significantly between them, so the motors are unlikely to be a straight swap. You should confirm this directly with the breaker, quoting your registration, so they can check whether the units are physically and electrically compatible. Never assume a part crosses a generation boundary without the breaker verifying it against your specific car.

For central locking motors, trim level and engine variant do not affect fitment — the motor is determined by the door and generation, not whether you have a 200, 250, 300, or 350. You can safely source from any equivalent SLK of the same generation regardless of engine size. The breaker will confirm compatibility against your registration to make sure the connector type and mechanism match.

The R171 ended in 2011 and the R172 began in 2011, so these are separate generations with different door structures, and a direct swap across that boundary is unlikely. Confirm with the breaker using your registration number, as they can check whether any parts overlap between the two generations. Do not assume compatibility just because the years are close together.

Yes, this can matter — some vehicles use different motor units or mechanisms for the driver's door versus the passenger doors, so always tell the breaker whether you need the NS (passenger side) or OS (driver's side) unit. On the SLK the driver's door may also incorporate the master locking switch, which could affect the part required, so be specific about which door is faulty. Quoting your registration and specifying the exact door location will help the breaker find the right unit.

Used central locking motors from a reputable breaker are generally a cost-effective repair, and breakers will usually have tested the unit or taken it from a car with known working electrics. It is worth asking the breaker what condition the donor car was in and whether the locking system was functioning before the vehicle was dismantled. As with any used electrical part, there is no absolute guarantee, but sourcing from a known generation match gives you the best chance of a straightforward fit.