Injector Resistance
WARNING: This page is about a different car, the 2001 Jaguar XKR, 2001 Jaguar XK8, 2001 Jaguar XJR, 2001 Jaguar XJ8, and 2001 Jaguar S-Type. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Disconnect appropriate injector harness connector. Measure resistance between injector terminals. On S-Type, resistance should be 12-16 ohms. On XJR, XKR, XJ8 and XK8, resistance should be 12-18 ohms. On all models, replace injector if resistance is not as specified.