Question

What are the consequences of not fixing the codes P1479 and P0171 on my 2003 Audi A4 1.8T? Is the car safe to drive?

Answer 1

P1479 Brake booster vacuum system :Mechanical failure

Could ba a simple faulty PCV system . The consequences is if it is not the pump being at fault, you may have to replace the pump system. And this is not safe to drive ,

Answer 2

P0171 AUDI Code - System Too Lean Bank 1
Read more: https://www.autocodes.com/p0171_audi.html

P1479 AUDI Code - Brake Vacuum System Mechanical Malfunction
Read more: https://www.autocodes.com/p1479_audi.html