Hi, I'm wondering if someone can help me with this. I've been getting a P0401 code on and off for the last 2 months. I have a hybrid civic 1.4 petrol with the 8 plugs. I tried a new generic egr valve replacement but code keeps returning. I'm currently on my second egr valve replacement, a second hand Siemens valve. I checked the resistances across the pins on the solenoid and they match a post that I came across, (pic below) . I also checked the voltage from the car's solenoid and am getting around 5 volts. My questions are, 1. Are the resistances on the valve ok for this car? 2. Is the voltage to the solonoid coming from the battery ok? 3. If the 5v supply to the valve is correct then what should be the settings if I use a power probe to test the valve? I really hope that someone can help me with this as I seem to be going round in circles. I tried to get the car into a Honda dealership to troubleshoot it and the soonest they could look at it is mid January and I don't want to wait that long. I've spoken to several mechanics and most of them don't even know what a P0401 code is which isn't very encouraging. Any help would be greatly appreciated. Many thanks