Oil Level Indicator Test

Ensure the following fuses are intact, switch is properly connected and engine oil level is correct:

• 325 Series - No. 4, 5, 6 and 12
• 525i and 535i - No. 1, 15, 17, and 20
• 735i - No. 10 and 12

Oil level sensor is located at bottom of oil pan. Sensor contains 2 switches. Use an ohmmeter to check switches. When oil level is low, dynamic switch (Blue/White wire) closes, and static switch (Blue/Violet wire) opens. When oil level is at correct level, static switch closes, and dynamic switch opens. If switch operation is incorrect, replace switch.