2006-2013 C70 T5. 2003-2004 C70 Base. 2004-2009 S40 T5. 2003 CTS (submodel: Luxury, Luxury Sport). 2003-2004 CTS Base. DRIVEWIRE MASS AIR FLOW SENSORS. Precise bore sizes allow proper tightening to prevent air leaks, which are a common trigger for false-positive trouble codes.