BMW and Audi share many platforms and engines but have different reliability profiles. N47 diesel was BMWs weakness. DSG and TFSI chain are Audis. We compare fault rates across both brands.
This Reliability guide combines structured analysis β verdicts, risk scoring and cost ranges where we have enough data β with real fault cases pulled directly from MyCarFault's reporting database, so the guidance below reflects what owners actually experience rather than manufacturer specifications alone. Background and analysis come first, followed by the linked fault reports and related guides you can jump to directly using the links above.
BMW and Audi are the two dominant premium compact and executive brands in Europe. They share VW Group and BMW Group engineering excellence but have distinct reliability records. This comparison covers fault rates, repair costs and long-term ownership data.
Current generation: very close. Historical: Audi had better diesel reliability (no equivalent of N47). BMW had better automatic gearbox (ZF 8HP vs S-tronic variants).
BMW β parts costs and independent specialist rates are marginally lower. Audi dealer rates can be higher.
Model-dependent. 3 Series and A4 hold value similarly. 5 Series ahead of A6 in most markets.