25-03-2021, 12:55 PM
Welcome to the club. Well, you've made a good start by identifying you have a low reference voltage for your sensors. My next steps would be to remove, clean & secure the grounds that the ECU use. I think they're the ones near the fuse box (drivers side wing on a left hand drive car?). Then inspect the wiring coming from all of the affected sensors, all the way back to the ECU. It's possible one of them has rubbed through somewhere & the 5v reference is being pulled to ground. You may need to remove the battery & battery tray & possibly unwrap the harness to make a proper inspection. I'm not sure how much space there is in that part of the engine compartment on a 1.4. (On a 2.0 there isn't much!).