Mercedes-Benz SL Oxygen Sensor Replacement Parts

Yes, petrol-engined SL models do carry oxygen (lambda) sensors, typically upstream and downstream of the catalytic converter to manage fuelling and monitor converter efficiency. However, the diesel SL variants use a different exhaust aftertreatment strategy and do not use a conventional narrowband or wideband oxygen sensor in the same way — if your SL is diesel, you may be looking for a NOx sensor or exhaust temperature sensor instead. Always check your fuel type before searching, as the two sensor types are entirely different parts.

No — the R129 (1989–2001) and R230 (2001–2012) are entirely different generations with different engine families, exhaust architectures, and emissions standards, so the sensors are not interchangeable. The R230 brought Euro 3 through Euro 5 compliance depending on year and engine, meaning later R230 cars use more sophisticated lambda sensing arrangements than the R129 ever had. Always supply your exact registration and engine code to the breaker so they can match the correct sensor position and specification.

The R231 SL ran from 2012 onward, with a significant facelift introduced in 2016 that brought updated engines including revised AMG units, which can change sensor specifications and wiring connectors. Whether a pre-2016 sensor crosses over to a post-2016 car depends heavily on whether the engine code changed at the facelift, and this is exactly the kind of detail you need to confirm with the breaker against your registration rather than assume. Give the breaker your engine code — not just the model year — and they can check part numbers directly.

Trim and badging do not affect oxygen sensor fitment — what matters is the engine code, not whether the car is a standard SL 400, SL 500, or AMG SL 63. However, the AMG SL 63 uses a different engine (the M157 or M177 depending on generation) compared with the SL 400's M276 or SL 500's M278, so those genuinely do require different sensors. In other words, always go by engine code rather than badge name, and be aware there may be two or more sensors per car (upstream and downstream positions) so confirm which position you need.

Possibly, but it depends on whether both cars share the same engine code, as the R230 was offered with several petrol engines across its life and sensors differ by engine and exhaust position. Euro 3 and Euro 4 era R230s (roughly pre- and post-2006 depending on engine) could have different sensor specifications even within the same generation, so a year-to-year swap is not automatic. Give the breaker both engine codes and confirm sensor position (upstream or downstream, NS or OS bank on V-engines) before purchasing.

If another Mercedes model shares an identical engine code and the same exhaust and emissions generation, the physical sensor may well be the same part, as Mercedes often carries sensors across its range. That said, exhaust routing and sensor positioning can differ between body styles even with the same engine, and any catalytic converter or emissions system differences between vehicles are strong confirm-with-breaker territory. Ask the breaker to cross-reference the part number against your specific SL registration rather than assuming cross-model compatibility.