Second Hand Mercedes-Benz S-Class Air Flow Meter

Yes, petrol-engined S-Class models use a mass air flow (MAF) sensor as part of the engine management system, and some diesel variants also use one depending on the engine generation. The specific fitment depends heavily on the engine code rather than the badge or displacement figure alone, so confirming your engine code from the V5 or a VIN check is the most reliable starting point. A breaker will use that code to verify whether their unit matches yours.

These are two separate generations — the W220 ran from 1998 to 2005 and the W221 from 2005 to 2013 — and the engine families and management systems differ substantially between them, making a straight swap very unlikely. Even where a similar engine code appears across both generations, ancillary components like the MAF sensor housing and connector can differ, so you should not assume cross-generation compatibility. Always confirm against your exact engine code with the breaker before purchasing.

No — trim level and body variant (including the long-wheelbase L models) do not affect which air flow meter is fitted; what matters is the engine code, fuel type, and the production year within the relevant generation. An S350 SE and an S350 L with the same engine code will use the same MAF sensor. Focus your search on confirming the engine code from your V5 rather than specifying trim or wheelbase to the breaker.

The W222 ran from 2013 with a facelift introduced in 2017, and while the core engine codes were carried across that facelift, ancillary and mounting changes mid-production mean you should not assume the MAF sensor is identical either side of 2017. Confirm your exact engine code and build date with the breaker against the registration of the car the part came from, as they can cross-reference this properly. Naming the facelift year to the breaker gives them a useful starting point for the check.

Many diesel S-Class variants, particularly those from the W220 onwards using OM-series engines, do incorporate a MAF sensor as part of the engine management system, though not every diesel engine variant uses one in the same way. The engine code is again the critical detail — two cars both badged S350d could use different engine management configurations depending on model year. Confirm the engine code from your V5 with the breaker to establish whether a specific used unit is correct for your car.

Whether the ECU needs to be reset or the MAF sensor paired or adapted after fitting is something you should confirm with a Mercedes-Benz specialist or the breaker, as this can vary by engine management generation and is not something we can state as fact for every variant. On some S-Class engine management systems an adaptation reset via diagnostic tool is recommended after replacing the MAF sensor for the ECU to calibrate correctly. A breaker familiar with Mercedes-Benz units will often be able to advise based on the specific engine code.