OBD Guide
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C1221

Left Front Wheel Speed Sensor Input Signal Is Zero

C1221 is an OBD-II diagnostic trouble code meaning: Left Front Wheel Speed Sensor Input Signal Is Zero. Common causes: wheel speed sensor malfunction, open or shorted wiring harness. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–89 (est.)

Symptoms

  • ABS/ESP indicator is on
  • Disabling the ABS system
  • Incorrect operation of cruise control
  • No signal on the speedometer (rare)

Causes

  • Wheel speed sensor malfunction
  • Open or shorted wiring harness
  • Damage to the ring gear on the hub
  • Connector pin corrosion
  • Sensor connection problems

How to Fix

  1. Check the integrity of the sensor wiring harness
  2. Clean sensor connector contacts
  3. Check the condition of the ring gear on the hub
  4. Replace the wheel speed sensor if necessary
  5. Check sensor resistance (usually 800-2500 Ohm)

Related codes

C1222C1223C1224

FAQ

What does the C1221 code mean?

C1221 is an OBD-II diagnostic trouble code that indicates: Left Front Wheel Speed Sensor Input Signal Is Zero

What causes a C1221 error code?

The most common causes of C1221 include: Wheel speed sensor malfunction; Open or shorted wiring harness; Damage to the ring gear on the hub; Connector pin corrosion.

How do I fix a C1221 diagnostic trouble code?

To fix C1221: Check the integrity of the sensor wiring harness. Clean sensor connector contacts. Check the condition of the ring gear on the hub. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1221?

Limited driving only, diagnose soon

How much does it cost to fix C1221?

The estimated repair cost for C1221 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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