Most engines have two major components: the engine block and the cylinder head. These two halves must seal to one another and act as one piece, or the engine will fail. The head gasket is a sealing layer of durable material that is sandwiched between the cylinder head and engine block. When tightened down, the cylinder head crushes the head gasket into the cylinder block, causing any imperfections to be sealed by force.

How often do head gaskets need to be replaced?

Head gaskets can fail at any time, but they typically last at least 100,000 miles, especially if the oil and coolant are properly maintained. In order to keep the gasket in good condition, dirty or contaminated fluids should be replaced on schedule, and the engine must run at the proper temperature. This is the best way to help prevent head gasket failure, along with avoiding aggressive driving.

How are head gasket issues diagnosed?

In general, there are a few signs that will point to head gasket failure. If engine oil and coolant are found mixed together, either in the engine or in the cooling system, the gasket is often the culprit. Further testing will be done, and a machine shop will try to confirm whether the head gasket is the problem.

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OBD Codes Related to Head Gasket Replacement

P00B7: Engine Coolant Flow Low/Performance P0217: Engine Coolant Over Temperature Condition

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