Febi 01788 Engine Coolant Level Sensor

Febi 01788 Engine Coolant Level Sensor

The febi 01788 engine coolant level sensor is a direct-fit replacement for BMW cooling system monitoring applications. Built with a black plastic body, 2 electrical connections, a 109.0 mm length, and a 30.0 mm outer diameter, it is specified for vehicles that use coolant level detection in the expansion tank.

Key Features

• Engine coolant level sensor for BMW cooling system service
• Black plastic construction for OE-style fit and function
• 109.0 mm overall length and 30.0 mm outer diameter
• 2 connection electrical design
• Febi part number 01788
• Cross-reference: BMW 61 31 1 378 320

Product Details

Febi, under the febi product line, supplies replacement components focused on accurate fitment and application-specific engineering. This coolant level sensor is used to monitor coolant level in the reservoir and trigger the warning system when fluid drops below the required threshold. It is a practical replacement for BMW 530i, 540i, 740i, 740iL, 750iL, 325i, 320i, 535i, 735i, 735iL, M3, 325e, and 635CSi applications listed for this part number 01788.

Compatible With BMW 530i, 1994-1995; BMW 540i, 1994-1995; BMW 740i, 1993-1994; BMW 740iL, 1993-1994; BMW 750iL, 1988-1994; BMW 325i, 1991-1993 and 1987-1990; BMW 320i, 1992; BMW 535i, 1989-1993; BMW 735i, 1987-1992; BMW 735iL, 1988-1992; BMW M3, 1988-1991; BMW 325e, 1984-1987; and BMW 635CSi, 1985-1989.

What It Helps Address

• Low coolant warning light staying on
• Intermittent coolant level warning messages
• Faulty coolant level readings from a worn sensor
• Replacement of a cracked or aged plastic sensor body
• Electrical connection issues at the coolant reservoir sensor

Installation Notes and Tips

Verify connector style, sensor length, and reservoir opening dimensions before installation. This part uses 2 connections and is intended for BMW applications that match the listed fitment and OE cross-reference. Inspect the coolant tank and sealing surfaces during service to help ensure a proper electrical and mechanical connection.

Quality Assurance

Febi replacement parts are built to meet application-specific requirements for European vehicle service. Part number 01788 is listed for the BMW applications shown above and cross-references BMW 61 31 1 378 320 for the same application.