In a lubrication system check, what is typically tested?

• A. Oil pressure and sensor operation
• B. Brake pad wear
• C. Coolant density
• D. Fuel injector spray pattern

Answer: (A)

Testing a lubrication system focuses on oil pressure and the sensor that reports that pressure. Oil pressure must be within the engine’s specified range to ensure proper lubrication of bearings and moving parts; too low can indicate a failing pump, worn clearances, or leaks, while too high might point to a relief valve issue or excessive viscosity. Verifying the sensor operation is essential because the readings shown to the driver or to the ECU must be accurate; a faulty sensor can hide a real problem or falsely indicate one. The other options aren’t part of a lubrication check: brake pad wear belongs to the braking system, coolant density concerns the cooling system, and the fuel injector spray pattern relates to the fuel system and combustion.