BMW 4 Series Problems: 9 Issues Every Owner Should Know
2014-2025 model years · 740+ owner reports · Updated April 2026
According to Au7o's analysis of 740+ owner reports, the 2014-2025 BMW 4 Series has 9 documented known issues, with 2 rated critical. The most serious are N20 Timing Chain Guide Failure (428i) ($2,000-$3,800 repair) and N20 Timing Chain Premature Failure - 428i F32/F33/F36 ($2,500-$4,500 repair). The most commonly reported issue is N20 Timing Chain Guide Failure (428i) with 290 owner reports. Across all issues, repair costs range from $150 to $4,500. DIY maintenance guides at au7o.io.