Remove the plastic engine cover and the air intake ducting/airbox to expose the top of the engine.
If reusing the injectors, soak the tips in a dedicated carbon cleaner or ultrasonic bath. Do not use harsh steel wire brushes on the delicate nozzle holes, as this can distort the spray pattern. Crucial Reinstallation Tips
Using controlled, firm strikes with the slide hammer, begin pulling the injector upward. Do not yank or use excessive force, as this could damage the cylinder head. The injector may require several strikes before it begins to move. Some mechanics recommend gently rotating or rocking the injector as you apply extraction force. If the injector remains seized, apply penetrating oil around its base and let it soak before trying again.
Complete Guide to VW 1.2 TSI Injector Removal: Tools, Steps, and Pro-Tips
Fit a brand-new intake manifold gasket. Bolt the manifold back onto the cylinder head using a crisscross pattern from the inside out to ensure an even seal (typically torqued to 10 Nm ).