Mango Madness

Made any progress?

We got there in the end, turns out it was the ECU. Despite scanning okay on the car it failed bench tests, weird. Put an immo free test brain in it and it fired up straight away. Thanks to everyone that chipped in 👍

Im not worried about the EPC fault indication, I’m more interested in the fact it wasn’t there previously during the multiple scans. You don’t always need specific experience to help, all cars work in essentially the same way. Any thoughts are always appreciated.

Thanks for the replies folks. I’ve been resurrecting VAG cars for 30 years and never seen anything like this. First thought was battery, Cliff, as it looked like it’d been there since WW2, brand new one installed. Carpets are dry and there’s no indication of ever having water ingress. Scanned with Vagcom/Rosstech and at an Audi dealership I’ve multimetered every wire l could find and there’s no continuity issues. Fuses changed just in case, as we used to say, “gone dry”, new relay fitted too while l was there. Here’s something new that’s literally just popped up for the first time. EPC Fault - See owners manual. Im now wondering if it is an ECU fault as Steve says. Thank goodness l kept the old Golf 4 PD130 just in case of emergencies. Hasn’t broken once since l bought it new in 2003..

Evening, hope you’re all well. Anybody heard of this scenario? BMN 170 won’t start despite there being literally nothing wrong with it. 0 faults found after several scans. No power to the tank pump when installed in the car. Been tested and works as it should on the bench. Everything electrical related to the fuel system has been checked. No wiring breaks, no sensor failures, everything is communicating as it should. Well and truly stumped. Any ideas? Thanks

It just feels electrical because of inability to communicate. Perhaps a h/s gateway module. How is your battery? If that’s dying it could be strong enough to start and idle but drop out when you put the load into the engine. You can get a boggo multimeter for £6. Cheap way to eliminate one problem straightaway and you can do a quick continuity test on all the plug connectors too. Won’t take long..

Evening, newbie here. If l give you a nudge in the right direction with yours maybe you can my car to start in return. I’ll be crying into a post about that later 😂 Looks to me like you’ve got a serious comms issue across the Canbus system (U112100 Databus missing message) I’d say there’s some wiring damage you can’t see..