Aftermarket value priced replacement Hot-Film Air Mass Meter, commonly referred to as the MAF sensor. This is the sensor that monitors air flow thru the intake and allows the computer to adjust fuel flow. Located just downstream from the airbox. O-ring is included with the Meter, but also available separately.

Fits the following JCW models with the N14 engine:

2007-07/2012 R56 JCW Cooper S Hardtop
2008-07/2012 R55 JCW Cooper S Clubman
2009-07/2012 R57 JCW Cooper S Convertible
2012-07/2012 R58 JCW Cooper S Coupe
2012-07/2012 R59 JCW Cooper S Roadster

Note: The part number varies depending on the engine type (N12, N14, N16, N18) and also different for the JCW models. The O-ring is the same for all models.

Select accordingly.