Good Morning, newbie here. Wondering if I could have an experienced eye check my Citroen C4 fuel pressure control valve pattern here. Logs a P0087 and seems to be running on low pressure pump only. As long as the (channel 2) current waveform looks OK to you guys, I think I'm ready to replace the HP pump. (have confirmed pressure sensor is reading/reacting). Cheers!
You are correct. Also these pumps fail very often. There is also a service bulletin that explains how to check the pump, but I don't have it available now.