4000 Series
- Check battery and voltage stabilizer for proper voltage. Remove center console. Start engine. Connect Tester (VW 1301) between gauge and ground.
- With dial set to 422, gauge should read 60°. With dial set to 146, gauge should read 90°. With dial set at 53, gauge should read 120°. If gauge needle is within tolerance ranges, oil temperature sender is defective.
- If gauge needle is outside tolerance ranges, oil temperature gauge is defective. Keep tester connected for a minimum of one minute to allow gauge to reach checking range.