C1893: Air Suspension LR Height Sensor Circuit Failure

What does C1893 mean?

C1893 is a diagnostic trouble code indicating "Air Suspension LR Height Sensor Circuit Failure". A sensor in the suspension is reporting abnormal data or has lost communication with the ECU. Sensors can fail due to age, contamination, heat exposure, or wiring issues.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Intermittent warning lights
• Erratic gauge readings

Common causes

• Faulty suspension component
• Wiring or connector issue in the related circuit
• Failed sensor providing incorrect readings
• Software/calibration issue requiring ECU update
• Related component causing secondary fault

What should you do?

This code sits in the suspension or ride height control. Handling and ride quality can change, especially on air suspension where the car may sag or refuse to raise. Get it diagnosed before loading the car up or towing.