Q: How to remove and replace fuel injectors and Fuel Rail on a Toyota Prius?
A: To begin with, release fuel pressure and disconnect the auxiliary battery's negative terminal. Remove the air filter housing. For pre-2010 models, disconnect fuel injector connectors. Reposition the wiring harness and disconnect the fuel line. For post-2010 models, remove the outer cowl assembly and EGR tube. Disconnect the EGR cooler assembly and fuel injector wiring. Remove the fuel supply tube clamp and fitting. Remove the fuel rail and injectors. Replace the O-ring, grommet, and cylinder head insulators. Lubricate the O-rings and reinstall the fuel injectors and rail.