Is Audi A5 TFSI reliable? Is the Audi A5 Reliable ? The 2022 Audi A5 has a predicted reliability score of 73 out of 100.27 Oct 2021. Which Audi A5 engine is best? Audi A5 Coupe diesel engines The 161bhp 2.0-litre TDI diesel engine is the most efficient in the A5 range, but it’s still capable of 0-62mph in 8.2 seconds. 2v4hIp.