Audi Q3 2.0 TDI Fuel filter replacement. How to replace diesel fuel filter. How to improve MPG

[@ashwathaman1819]

I'm considering a purchase from the Audi Approved Plus team in India - it's an Audi Q3 2013 Premium Plus Diesel model. However, I've come across a few concerns: the vehicle has a steering box issue, lapsed insurance, and tyres that are about 50-60% worn. I'm particularly keen on understanding the implications of the steering box problem. Could you provide any insights or perhaps an estimate on the cost of a new steering box assembly for this model? Your guidance would be invaluable as I navigate this potential purchase. Many thanks in advance