Is the clutch master cylinder covered under ford focus powertrain warranty?

No, the clutch master cylinder is generally not covered under a Ford Focus powertrain warranty. Powertrain warranties typically cover the engine, transmission, and related components directly involved in powering the vehicle. The clutch master cylinder is part of the hydraulic clutch system, which is often considered a separate drivetrain component and falls under the vehicle's basic warranty or may not be covered at all depending on the specific warranty terms and the age/mileage of the vehicle. Always check your specific warranty documentation for details.