Piezoelectric Fuel Injectors, Checking

WARNING: This page is about a different car, the 2011 Audi Q7, 2010 Audi Q7, and 2009 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

There are 4 ways to check the injectors.

Refer to PIEZOELECTRIC FUEL INJECTOR QUANTITY AND PRESSURE CALIBRATION, PERFORMING AN ADAPTATION .
Refer to OPEN FUEL INJECTORS, CHECKING .
Refer to PIEZOELECTRIC FUEL INJECTORS, CHECKING RETURN QUANTITY WITH ENGINE RUNNING .
Refer to PIEZOELECTRIC FUEL INJECTORS, CHECKING RETURN QUANTITY AT STARTING SPEED .

Perform the following tests first if the vehicle is not starting:

Refer to OPEN FUEL INJECTORS, CHECKING
Refer to PIEZOELECTRIC FUEL INJECTORS, CHECKING RETURN QUANTITY AT STARTING SPEED
Refer to Fuel Pressure Regulator Valve -N276-, CHECKING