If the air coming out of the A/C system in your MK3 generation (2011, 2012, 2013 & 2014) Ford Focus is starting to smell funky, you probably need to clean or change the HVAC cabin air filter element in the blower motor housing. Check out my DIY tutorial for the procedure, with replacement part numbers, by clicking on the text link or thumbnail picture below.
Ford Focus Cabin Air Filter Change Instructions
