Hello Audi owners!

I’m seeking for some help and advice. 
 

recently just bought an Audi A3 TDI 2.0 diesel Quattro. 
 

my coolant drops massively after motorway journeys I’ve had it pressure tested and had a full diagnosis done showing no faults anywhere. 
 

recently my particulate filter warning keeps coming on and after a motorway regen to heat the exhaust to clear the warning it causes my coolant to drop 

had it to a garage twice undergone tests and can find nothing wrong with the car 

appreciate any help and advice 

cheers 

My bet is the DPF cooler leaking. It's a common problem and is often not detected by a pressure test. If so, there is a chance the DPF is also in need of cleaning or replacement. If bought in the last month from a dealer I suggest you return it because the repair will be expensive.

I agree with Cliff, get this back to the dealer you bought it from asap. I wonder if this is the reason the previous owner traded it in....

thanks guys!
 

The cars under warranty and the dealership has offered to pay for any repairs but it’s finding a garage to give me the right diagnosis so I can get the invoice sent over. 

what test would you recommend I ask for to be the correct diagnosis 

Don't bother. Take the car back, get a refund, and let the dealer sort it out.

What course of action did you decide upon Bradley?