BMW timing chain replacement costs vary dramatically by engine. N47 requires gearbox removal (£1,500-3,200). N57 front-mounted chain is cheaper. B47 most accessible.
This Repair Cost Guide guide combines structured analysis — verdicts, risk scoring and cost ranges where we have enough data — 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 timing chain replacement is one of the most discussed repairs in the premium car market. Costs vary enormously depending on which engine you have — the N47 diesel is the most expensive due to its rear-mounted chain position, while the B47 replacement is far more straightforward.
No — chain jump destroys the engine instantly. Stop driving if rattle persists beyond cold start.
Usually yes on E90/E91/E87. Some independent specialists have developed methods to avoid full gearbox drop but most require it.