Arnott RH-4387 Headlight Level Sensor - Front or Rear

BMW and MINI Ride Height Sensor

Arnott RH-4387 is a new headlight level sensor used in BMW and MINI air suspension systems to monitor chassis height and send position data to the ECU. That signal helps the system adjust air pressure in the struts so the vehicle stays level under changing load and road conditions.

Compatible With select BMW X3, X4, X5, X6, X7, XM, i3, i8, 3 Series, 1 Series, 2 Series, and MINI Cooper applications, this sensor addresses common ride-height feedback issues on front and rear positions where listed. Arnott RH-4387 is a direct-fit style replacement for vehicles that rely on accurate suspension height input.

Key Features

• New aftermarket ride height sensor from Arnott
• Black female connector with oval shape
• 3-pin male terminal design
• Standard grade construction
• Mounts in front or rear applications depending on vehicle fitment
• Cross-references BMW part numbers 37146853747 and 37146867646

Detailed Description

The Arnott RH-4387 sensor measures the distance between the road and the chassis and relays that information to the ECU for suspension leveling control. On BMW and MINI models with air suspension or height-based leveling systems, accurate sensor input is critical for maintaining proper ride height and consistent headlight leveling. This part number, RH-4387, is listed for a wide range of BMW X5, X6, X7, X3, X4, X1, X2, i3, i8, 3 Series, and MINI Cooper applications across 2014-2025 model years.

This part cross-references BMW OE numbers 37146853747 and 37146867646 for the same application.

Common Problems This Part Can Address

• Incorrect ride height readings
• Uneven vehicle stance
• Suspension warning messages related to height sensing
• Air suspension compressor cycling from inaccurate sensor input
• Headlight leveling issues tied to chassis height data

Installation Notes and Tips

• Verify the vehicle position and model year before ordering; fitment varies by front and rear location.
• Inspect the connector, terminals, and mounting point for corrosion or damage before installation.
• Confirm the sensor arm and linkage move freely and are not binding.
• After installation, clear fault codes and verify suspension leveling operation.

Quality Assurance

Arnott supplies this RH-4387 sensor as a new replacement part built to standard specifications for BMW and MINI applications. It is intended to restore accurate height-sensing input to the vehicle’s suspension control system.