OBD Guide
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C1104

Front Left Sensor 1

C1104 is an OBD-II diagnostic trouble code meaning: Front Left Sensor 1. Common causes: open or short circuit in the sensor wiring harness, malfunction of the sensor itself. Estimated repair cost: $56–167.

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

Symptoms

  • The ABS or stabilization system indicator is on
  • ABS system does not work
  • Unstable operation of the stabilization system

Causes

  • Open or short circuit in the sensor wiring harness
  • Malfunction of the sensor itself
  • Damage to the gear wheel (benchmark) on the hub
  • Poor contact in the sensor connector
  • ABS control unit malfunction

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Check resistance and sensor signal
  3. Inspect the gear on the hub
  4. Check the sensor connector for corrosion or damage.
  5. If necessary, replace the sensor or repair damaged wires
  6. Check the operation of the ABS system after repair

Related codes

C1101C1102C1103C1105

FAQ

What does the C1104 code mean?

C1104 is an OBD-II diagnostic trouble code that indicates: Front Left Sensor 1

What causes a C1104 error code?

The most common causes of C1104 include: Open or short circuit in the sensor wiring harness; Malfunction of the sensor itself; Damage to the gear wheel (benchmark) on the hub; Poor contact in the sensor connector.

How do I fix a C1104 diagnostic trouble code?

To fix C1104: Check the integrity of the sensor wiring harness. Check resistance and sensor signal. Inspect the gear on the hub. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1104?

Limited driving only, diagnose soon

How much does it cost to fix C1104?

The estimated repair cost for C1104 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat