Left Front Wheel Speed Sensor A Circuit Low

Where it lives

For C0502, the circuit described runs through the sensor. The description of C0502 reports a fault at the sensor.

Check these first

• A damaged left front wheel speed sensor
• Metal debris packed onto the left front tone ring
• A cracked or damaged left front reluctor ring
• A chafed sensor harness at the left front wheel
• Corroded pins in the left front sensor connector

What to do next

1. Inspect the left front sensor and tone ring for debris and damage
2. Check the sensor harness where it bends at the left front strut
3. Measure the left front sensor resistance against a known value
4. Compare all four wheel speed readings on a scan tool while rolling
5. Replace the left front wheel speed sensor if its signal drops out
6. Clear the code and retest

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