Arnott RH-3780 Suspension Ride Height Sensor - Rear Left

Arnott OES Ride Height Sensor RH-3780

Arnott RH-3780 is an OES suspension ride height sensor that reports chassis height to the ECU so the air suspension system can adjust ride height as needed. It is a new, standard-grade replacement with a black connector, rectangular 1-connector design, and 3 blade terminals for the rear left position.

Key Features

• OES ride height sensor for air suspension leveling
• Measures the distance between the road and the chassis for ECU input
• New, standard-grade replacement sensor
• Black male connector with rectangular shape
• 3 blade terminals, male terminal design
• Rear left application for select Lexus LS models

Product Details

Arnott’s OES ride height sensor line focuses on restoring accurate suspension height feedback for vehicles equipped with air suspension. This RH-3780 sensor helps the ECU determine when to command the compressor to add or release air from the air struts, supporting proper vehicle stance and suspension response. It is a direct-fit style replacement for select Lexus LS460 and Lexus LS600h models, including Fits 2007-2017 Lexus LS460, Rear Left and Fits 2008-2016 Lexus LS600h, Rear Left. This part cross-references Toyota 8940850070 for the same application.

What It Helps Address

• Incorrect ride height readings from a worn sensor
• Air suspension that sits too high or too low
• Delayed or inconsistent compressor commands
• Suspension warning concerns tied to height feedback
• Damage from road debris, water, salt intrusion, or impact

Installation Notes

Verify rear left placement before installation and confirm connector style, terminal count, and mounting points match the original sensor. Inspect the surrounding suspension components, wiring, and linkage for corrosion or damage before replacing the sensor. After installation, clear any stored suspension faults and confirm the system levels correctly during a road test.

Quality Assurance

Arnott manufactures this OES sensor as a new replacement part for air suspension systems, with construction intended to restore accurate height signal input to the ECU. Use the part number RH-3780 and the vehicle fitment details to confirm application before ordering.