Cheap Mercedes-Benz SL Ignition Switch

The Mercedes-Benz SL has used traditional ignition switch assemblies across most of its generations, though later models moved toward keyless start systems where a conventional ignition switch no longer exists in the same form. If your SL uses a push-button start, the part you may actually need is the EIS (Electronic Ignition Switch) module or the keyless start button assembly rather than a traditional ignition barrel. Check which system your car has before searching, as the two are not interchangeable. Confirm the exact part reference with a breaker against your registration.

The R107 ran from 1971 to 1989 and the R129 from 1989 to 2001 — these are entirely different generations with different steering columns, wiring harnesses, and ignition assemblies, so the parts are not interchangeable. You should source an ignition switch specifically matched to your generation. Confirm the exact year and any mid-life changes with the breaker against your registration to make sure you get the right unit.

For traditional ignition switches on the R129 (1989–2001), the switch is a steering-column-mounted component and engine size does not typically affect which switch fits — fitment is generation and column-type dependent rather than trim or engine dependent. That said, there were running changes across the R129's long production life, so a breaker should confirm compatibility against your specific registration before you commit to a purchase.

The R230 SL (2001–2011) and R171 SLK (2004–2011) are related Mercedes-Benz roadsters from a similar era and share platform DNA, so there is a possibility of ignition switch crossover, but this is not something to assume without checking. Differences in column design, EIS modules, and wiring can mean parts look similar but are not directly compatible. Route this question to a breaker who can cross-reference part numbers against both registrations before purchasing.

The R230 received a significant facelift in 2008, and while some components carried over, electrical and column-mounted parts can differ across that boundary. Whether the ignition switch or EIS unit is identical on both sides of the 2008 facelift is not something to assume — confirm this with the breaker against your registration. They can check part numbers to tell you definitively before you buy.

Yes, this matters significantly — the R231 SL (2012 onwards) was offered with keyless entry and push-button start, meaning many of these cars do not have a traditional ignition switch at all. If your R231 has push-button start, the component you are likely after is the EIS module or the start button itself, not a conventional ignition barrel. Confirm exactly which system your car has and describe it clearly to the breaker so they can supply the correct part for your registration.