Fuel Injectors, Checking

WARNING: This page is about a different car, the 2015 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

There are three ways to check the fuel injectors.

Refer to FUEL INJECTORS, ADAPTING CORRECTION VALUES
Refer to FUEL INJECTORS, CHECKING RETURN QUANTITY WITH ENGINE RUNNING
Refer to FUEL INJECTORS, CHECKING RETURN QUANTITY AT CRANKING SPEED