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A fuel injector sleeve, also known as an injector nozzle sleeve, is a component that surrounds the injector nozzle within the cylinder head. It helps in aligning the nozzle and improving the sealing between the injector and the combustion chamber.

The sleeve's design influences the injector's positioning and sealing, which can enhance fuel atomization and distribution within the combustion chamber, leading to improved combustion efficiency.

Symptoms may include fuel leaks around the injector, rough engine idle, or decreased engine performance. Prompt inspection and replacement are essential to prevent further engine issues.

In many cases, the injector sleeve can be replaced separately. However, it's advisable to consult with a professional mechanic to assess the condition of both the sleeve and the injector before proceeding with replacement.