Electronic Throttle Body Assembly for Lacetti 1.4 DOHC Engine 2003-12 The throttle body is a valve that regulates the amount of air entering the engine.It is positioned between the air filter and the engine block, connecting to the intake manifold known as the throat of the engine.This electronic throttle body uses the throttle position to control the angle of the valve, allowing precise adjustment of the air intake based on engine demand.This unit is designed for use with the following applications: Lacetti engine 1.4, 1.6 DOHC 2003–2012 Optra J200 Nubira engine 1.4i, 1.6i Compatible with OEM numbers: 96815480 96394330 Specifications: Electronic Throttle Body Assembly Manufactured and tested to OE standards Factory tested No installation instructions included