C0159 moderate

Ride Height Sensor Rear Left Circuit Malfunction

The C0159 code means the vehicle's onboard diagnostic system has detected: Ride Height Sensor Rear Left Circuit Malfunction. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $100 - $500 (parts and labor)

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LAUNCH CRP123X (Reads ABS + Chassis)

Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.

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Common Symptoms

Suspension fault warning displayed
Rear left of vehicle sagging
Air suspension not leveling properly
Headlights aimed incorrectly
Rough ride quality over bumps

Probable Causes (Ranked by Likelihood)

Failed rear left ride height sensor Very High
Sensor linkage disconnected or broken High
Water damage to sensor from road spray Moderate
Wiring damage near rear suspension Low

Step-by-Step Diagnostic Procedure

Scan suspension module for rear sensor DTCs
Compare rear left sensor reading to rear right
Inspect sensor and linkage at rear left corner
Check for water damage at sensor connector
Test sensor through full range of suspension travel

Frequently Asked Questions

Why do rear ride height sensors fail more often?

Rear sensors are more exposed to road spray, salt, and debris compared to front sensors. This exposure accelerates corrosion of the connector and sensor housing.

Can I drive with a failed ride height sensor?

You can drive short distances, but the suspension system may not level properly. The vehicle may sit unevenly and the ride quality will be degraded. Some vehicles limit speed.

What happens if I ignore this code?

The air suspension compressor may overwork trying to compensate for incorrect readings, potentially burning out. The uneven ride height also causes accelerated tire wear.