Well after lots of research and worry, I decided against the purchase of that particular car! I noticed a couple of electrical warnings, and with the wet boot, I think it may have been an ongoing problem. So just waiting for my deposit back.
Finding it very difficult to find a good used Q7!
Thank you for your help and advice though.
Glad you got sorted 🙂
If it's any consolation I get my wife to take her jaguar to have her xe adblue topped up, as jags are known for adblue system issues. This has saved us twice when the system has gone faulty and they've had to drain the tank, reset the sensor and top it back up FOC twice.
My rationale is, if they do it then we can't be blamed for it being over filled or wrong adblue fluid added etc.