Cheap Mercedes-Benz SLK Fuel Injector

Fuel injectors exist on all SLK engine variants, but the type differs critically by fuel system: petrol engines use port or direct fuel injectors depending on the generation and engine code, while there were no diesel SLK models sold in the UK, so all UK SLKs are petrol. The key split is between older port-injection engines and later direct-injection units, so you must match the injector to the specific engine code rather than just the model name.

The R170 ran from 1996 to 2004 and the R171 from 2004 to 2011, and these are entirely different engine families with different injection systems, so injectors are not interchangeable across that boundary. Your engine code, found on your V5 or via a VIN check, is the only reliable way to match the correct injector — confirm with the breaker against your registration before buying.

Both a 2007 and a 2010 SLK sit within the R171 generation (2004–2011), so they share the same basic platform, but fitment still depends on whether both cars share the same engine code, as the R171 was offered with several different engines including the SLK200, SLK280, SLK300, and SLK350. Match the engine code exactly and confirm the specific injector part number with the breaker against your registration, as there can be mid-run changes within a generation.

Trim level itself does not affect injector fitment, but in this case the trim names on the SLK directly reflect different engines — the SLK200 Kompressor uses a supercharged four-cylinder with a specific injection setup, while the SLK350 uses a larger V6 with its own injector specification, so these are genuinely different parts. Always cross-reference by engine code rather than badge name, as this is what the breaker will use to verify the correct part for your car.

The R172 generation ran from 2011 to 2016 and introduced updated engines compared to the R171 (2004–2011), so injectors from these two generations are not a straight swap. Even where engine families appear similar across that 2011 boundary, confirm fitment with the breaker against your specific engine code and registration before purchasing, as injection system specifications changed between generations.

Whether a used injector requires ECU coding or immobiliser adaptation depends on the specific engine management system fitted to your car, and this is something you should confirm directly with the breaker against your registration rather than assume either way. A good breaker familiar with Mercedes engines will be able to advise, and it is worth also checking with a Mercedes specialist or diagnostics garage before fitting a used injector to your R171 or R172.