CUSTOMER CONCERN The oil-pressure warning light comes on while the engine is running, and DTC P0521 is stored. CAUSE Pressure comparison and circuit checks confirmed a failed engine oil-pressure sending switch. CORRECTION Remove and replace the engine oil-pressure sending switch.

CUSTOMER CONCERN The oil-pressure warning light comes on while the engine is running, and DTC P0521 is stored. CAUSE Mechanical and scan-data checks confirmed a failed engine oil-pressure sending switch rather than a loss of indicated pressure elsewhere in the circuit. CORRECTION Remove and replace the engine oil-pressure sending switch.