Nissan B20db-54 -

If you see a master cylinder listed for a "Nissan Maxima" but the photo shows a reservoir without the distinct "step" shape, it is not a true B20db-54. Walk away.

: Use a professional-grade scanner (like Nissan CONSULT-III Plus) to perform the "Height Sensor Initialization" procedure. Nissan B20db-54

This code appears when the vehicle's automatic headlight leveling system or advanced suspension height sensors have not been properly initialized or calibrated following a repair, battery disconnect, or module replacement. If you see a master cylinder listed for