Depends on the car If you can see the injectors, you'll need to disconnect the wiring harnesses from the injectors... (there is also usually a boot over the injector) You then need to disconnect the injector from the fuel rail. (careful not to strip the little fitting) You can then use a wrench or injector socket to remove the injector. Make sure you replace the gaskets and seals when installing the new injectors.(might need teflon tape around the pipe fitting where the injector feeds from the fuel rail).
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