Vehicle Compatibility Information For Acura ILX 2.0L 2013-2015 For Honda Civic 1.8L 2012-2015 For Honda HR-V 1.8L 2016-2022 What is a throttle body ? The throttle body is the part of the engine that mixes air with the fuel to allow combustion to take place. When a throttle body gets clogged with carbon, the vehicle may suffer from issues ranging from a lack of fuel mileage, loss in efficiency or may even become totally inoperable. When you need to replace the throttle body: .