OBD Guide
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C1890

Air Suspension Left Front Height Sensor Circuit Open

C1890 is an OBD-II diagnostic trouble code meaning: Air Suspension Left Front Height Sensor Circuit Open. Common causes: broken wires in the height sensor harness, poor contact in sensor connectors. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Uneven body height (left front corner sags or is too high)
  • Suspension fault indicator is on
  • Air suspension error message on display
  • Uneven tire wear
  • Deterioration in vehicle handling

Causes

  • Broken wires in the height sensor harness
  • Poor contact in sensor connectors
  • Malfunction of the height sensor itself
  • Corroded contacts or terminals
  • Damage to wiring harness due to vibration or mechanical impact
  • Air suspension control module malfunction

How to Fix

  1. Visually inspect the sensor wiring harness for damage
  2. Checking the continuity of the sensor circuit with a multimeter
  3. Cleaning connector contacts from corrosion
  4. Replacing damaged wires or connectors
  5. Checking the functionality of the height sensor
  6. Resetting the error and testing the system
  7. If necessary, replace the height sensor or control module

Related codes

C1891C1892C1893C1894

FAQ

What does the C1890 code mean?

C1890 is an OBD-II diagnostic trouble code that indicates: Air Suspension Left Front Height Sensor Circuit Open

What causes a C1890 error code?

The most common causes of C1890 include: Broken wires in the height sensor harness; Poor contact in sensor connectors; Malfunction of the height sensor itself; Corroded contacts or terminals.

How do I fix a C1890 diagnostic trouble code?

To fix C1890: Visually inspect the sensor wiring harness for damage. Checking the continuity of the sensor circuit with a multimeter. Cleaning connector contacts from corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1890?

Limited driving only, diagnose soon

How much does it cost to fix C1890?

The estimated repair cost for C1890 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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