Vehicle Compatibility Information Ford Fusion 2014-2020 L4 1.5L Ford Escape 2017-2019 L4 1.5L Does throttle body need to be replaced? The throttle body plays a large role in controlling the fuel and air mixture in your engine.The proper mixture needs to be achieved in order for your engine to run smoothly and properly. Once this part fails, it needs replacing rather than repairing. When you need to replace the throttle body: 1. Check engine light and/or reduced power warning light is on. If the check engine light or reduced power warning light comes on, a mechanic will determine if any of the stored trouble codes implicate a throttle body malfunction. .
