Head gasket failure is one of the most expensive repairs a car owner can face. We break down real costs by engine type, labour rates and which associated parts you must replace at the same time.
This Repair Cost Guide 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.
Head gasket failure sits near the top of every mechanics list of catastrophic repairs. The gasket itself costs Β£20β80, but the labour to reach it β stripping the top end of the engine, removing the cylinder head, having it machined flat if warped β runs 8 to 20 hours. That is where the bill grows. On a modern diesel with complex ancillaries, expect to remove intercooler pipework, camshaft covers, timing components and, on rear-wheel drive cars with the engine mounted longitudinally, potentially the gearbox.
If a head gasket fails on a vehicle worth less than the repair cost, weigh it carefully. On a Toyota, Honda or Subaru known for longevity, repair makes sense. On a high-mileage example of a problematic engine family β BMW N47, GM Z20LEH, early Ford 1.8 TDCi β consider whether the repair cost is justified. Always get two quotes: dealer versus independent specialist pricing often differs by 40β60%.
No. Further driving causes progressive damage β the head warps further, combustion gases contaminate the coolant, and the overheating can destroy pistons and cylinder walls. Stop driving immediately.
No. Sealers work on pinhole leaks only and clog other passages over time. They are a temporary measure to get you home, not a repair.
One to three working days depending on engine complexity and whether the head needs machining (add 1β2 days if sent to an engineering shop).
Yes, unless it has been verified perfectly flat with a straight-edge and feeler gauge. Warped heads will cause the new gasket to fail quickly.