Car wont start -(AUDI A6 TDI DIESEL 3.0 2007)

[Twirly22]

my dad's car won't start - I have tried changing the fuel filter as the vehicle hasn't been serviced for a while - thought that might have been the problem. the battery wasn't the problem either, double-checked it and tried to start the car with 2 batteries yesterday but had no luck. 

i plugged in my Foxwell i70ll obd reader to see if any codes came up - only about the number plate bulb and the swirl flaps. but I already know about them. 

 

if anyone can help, that would be fantastic, thank you. 

 

[Steve Q]

I'd recommend a diagnostic check to see if any fault codes flag up. Could be an issue with the imobiliser