If the engine cannot be stopped or the engine cannot be started (lack of fuel in the injectors), then you should check the electrical supply circuit of the valve, as well as the resistance of its electromagnet.
1. Remove valve (wrench 8.0117 AE must be used for electrically actuated Bosch valves).
2. Measure the resistance of the electromagnet (about 8 ohm). If the measured resistance value does not match the above, the valve must be replaced.
3. Fit the valve fitted with a new O-ring and tighten to 15 Nm (Roto Diesel) or 20 Nm (Bosch).