Drove the van for a couple hours yesterday, with new turbo installed.
Observations which may prove valuable to other members of the forum:
- When the turbo failure occurred, I got the flashing coil and an AdBlue error. The AdBlue error is confusing (blurry photo attached). You get an amber gear + refill icon with a mileage countdown. This appears to start at 600 miles regardless of your reservoir (1000km in EU to the nearest 50 sounds probable), and is a countdown before the engine will fail to start. This is not related to the amount of AdBlue in the reservoir (mine was full), it is indicating a fault with the AdBlue system which requires attention immediately (injector, pump, etc). I’m guessing the engine can run indefinitely with faults in the AdBlue system, so this countdown is there to force the owner to get it resolved. To be clear, this amber flashing gear + refill icon cannot be resolved by topping up the AddBlue. When I entered the cheat code (above), the orange icon disappeared and the countdown was replaced with the standard AdBlue countdown - and mine reverted from the amber 450 miles to the standard white display showing 5500 miles (again, because I was full or very nearly - I believe the max is 6000 miles).
- Two prior issues I had with the van now appear to be resolved!
1) I always had a vibration around 44mph when the van shifts down into 7th gear. When my van sat low in a gear, the van would vibrate/shutter, enough that I went mental with fabric tape to eliminate every rattle in the cab area and camper area. This was part of my motivation for the remap. I thought changing the power profile would resolve this. When it would annoy me, I’d manually move my DSG down to 6th and it would smooth out when running at higher RPM. With the new turbo, this is gone!
2) When parking/maneuvering the van at low speed and sometimes idling, I would get a noticeable whirring sound from the engine. I suspected it was the turbo. Guys at the garage said they hadn’t heard it before but it could be “back pressure on the turbo because the engine is idling at a low speed”. They thought it was of no concern. With the new turbo, this is now gone, too!
- I now suspect this turbo has been failing for 2 years+. Was the small turbo slowing/getting stuck at low RPM? Or are both issues due to the split vacuum hose I mentioned earlier? (I now know this vacuum hose was to a sensor which would indicate boost pressure… or something… but not actually feeding the turbo.)
- My final hope is that some aspect of this turbo failure has caused my excessive oil usage. The garage says the engine exterior is “bone dry” with no indication of an oil leak. I had observed that oil usage was higher for start/stop urban driving, and far lower for motorway miles. The turbo is in higher demand for acceleration than constant speed, so this has me hoping there’s a connection which will now mean this is resolved. I’ll just have to wait and see!
All Google searches around the T6 already point to this forum. Hopefully these observations help someone else. I had searched up the vibration and whirring sound ages ago and couldn’t find anyone else with that experience. This might help someone down the line!
Observations which may prove valuable to other members of the forum:
- When the turbo failure occurred, I got the flashing coil and an AdBlue error. The AdBlue error is confusing (blurry photo attached). You get an amber gear + refill icon with a mileage countdown. This appears to start at 600 miles regardless of your reservoir (1000km in EU to the nearest 50 sounds probable), and is a countdown before the engine will fail to start. This is not related to the amount of AdBlue in the reservoir (mine was full), it is indicating a fault with the AdBlue system which requires attention immediately (injector, pump, etc). I’m guessing the engine can run indefinitely with faults in the AdBlue system, so this countdown is there to force the owner to get it resolved. To be clear, this amber flashing gear + refill icon cannot be resolved by topping up the AddBlue. When I entered the cheat code (above), the orange icon disappeared and the countdown was replaced with the standard AdBlue countdown - and mine reverted from the amber 450 miles to the standard white display showing 5500 miles (again, because I was full or very nearly - I believe the max is 6000 miles).
- Two prior issues I had with the van now appear to be resolved!
1) I always had a vibration around 44mph when the van shifts down into 7th gear. When my van sat low in a gear, the van would vibrate/shutter, enough that I went mental with fabric tape to eliminate every rattle in the cab area and camper area. This was part of my motivation for the remap. I thought changing the power profile would resolve this. When it would annoy me, I’d manually move my DSG down to 6th and it would smooth out when running at higher RPM. With the new turbo, this is gone!
2) When parking/maneuvering the van at low speed and sometimes idling, I would get a noticeable whirring sound from the engine. I suspected it was the turbo. Guys at the garage said they hadn’t heard it before but it could be “back pressure on the turbo because the engine is idling at a low speed”. They thought it was of no concern. With the new turbo, this is now gone, too!
- I now suspect this turbo has been failing for 2 years+. Was the small turbo slowing/getting stuck at low RPM? Or are both issues due to the split vacuum hose I mentioned earlier? (I now know this vacuum hose was to a sensor which would indicate boost pressure… or something… but not actually feeding the turbo.)
- My final hope is that some aspect of this turbo failure has caused my excessive oil usage. The garage says the engine exterior is “bone dry” with no indication of an oil leak. I had observed that oil usage was higher for start/stop urban driving, and far lower for motorway miles. The turbo is in higher demand for acceleration than constant speed, so this has me hoping there’s a connection which will now mean this is resolved. I’ll just have to wait and see!
All Google searches around the T6 already point to this forum. Hopefully these observations help someone else. I had searched up the vibration and whirring sound ages ago and couldn’t find anyone else with that experience. This might help someone down the line!