fabio978

Hi everyone, since last december, my 2012 Octavia Wagon TDI RS started showing glow plug indicator. At the beginning, this was very occasional, like once a month or maybe less, but in the last 3 months it's happening more often and on the last weeks it's basically persistent. As I am using Torque app connected through ELM327 OBD device, I could see the error is almost always P2564, and sometime P2563. Doing a research on the web, the most common cause seems to be the VNT actuator, which needs to be replaced, but it can also be the turbo variable geometry or the turbo itself. I think I can exclude faulty wirings as the issue appears all the time in the same condition: when I am driving normally, no issues at all, but whenever I slow down like below 10km/h or I completely stop the car, the light turn on and the car goes in limp mode. Luckily I can clear the error and then comes back to normal, but I have to do this while moving otherwise the error will appear immediately again, so it seems this is related to the boost pressure. Using Torque, I also noticed when the engine is idle, the boost indicator switches to "vacuum" and it shows negative values. When I don't have the problem I have a value of -0.69, while when the problem appears is around -0.99 and it can go as low as -1.6. This said, do you think it can be still related to the VNT actuator or it can be the turbo? When I clear the error, the car works normally, I cannot notice any power loss or strange noises from the turbo. Unfortunately I recently moved on a new town and I still don't have a thrusted mechanic.. I wanted to ask an opinion here because as usual there is a risk the mechanic makes you pay the most even if it's a simple problem..