Used Mercedes-Benz CLS Air Flow Meter

Yes, but only on petrol-engined CLS variants — the air flow meter (also called a MAF sensor) measures incoming air to help the ECU calculate fuelling on petrol engines. Diesel CLS models use a different fuelling strategy and do not use a conventional air flow meter in the same way, so if you have a diesel CLS you are likely looking for a different sensor such as a boost pressure or air mass sensor specific to diesel systems. Always confirm which part your vehicle needs with a breaker by supplying your registration or engine code.

The CLS has run across two main generations: the first-generation C219 from 2004 to 2010, and the second-generation C218 from 2011 to 2018 (with a facelift around 2014), plus the third-generation C257 launched in 2018. The engine codes differ significantly across these generations, so an air flow meter from a C219 will not simply drop into a C218 or C257 even if the engine displacement looks similar on paper. Your engine code — found on your V5 or via a VIN check — is the critical detail to give a breaker when sourcing a used unit.

A 2009 CLS sits in the first-generation C219, while a 2012 CLS is in the second-generation C218, so these are entirely different platforms with different engine families. Even where engine displacement appears similar, the engine codes will differ and the air flow meter is matched to the specific engine and its management system, so a straight swap across that generation boundary is very unlikely. Give your engine code to a breaker and ask them to confirm part compatibility against your registration before purchasing.

Trim level does not affect the air flow meter — this is a mechanical part that follows the engine code, not the badge or equipment level. An AMG Line CLS fitted with the same engine code as a standard CLS will use the same air flow meter, so there is no need to specify trim when searching. What does matter is your exact engine code, fuel type, and whether your engine has any running changes, so supply those details to the breaker.

The '350' badge is a useful starting point but it is not enough on its own, because Mercedes used different engine codes under the same badge at different points in production. The air flow meter must match your specific engine code rather than just the displacement or badge, so two CLS 350s from the same year could theoretically have different requirements if the engine was revised mid-production. Pull your engine code from your V5 or a VIN decoder and quote it to the breaker so they can match the correct unit.

Whether a used air flow meter requires any ECU pairing or coding after fitting is something you need to confirm directly with the breaker or a Mercedes specialist against your specific registration, as this can vary by engine variant and model year. It is not something that can be stated with certainty as a blanket rule, so it is worth raising the question before you buy rather than after. A good breaker should be able to advise based on experience with that engine family.