C1155
Wheel Speed Sensor LF Input Circuit Failure
Findings, check these first
- Failed left front wheel speed sensor
- Open or shorted LF sensor circuit
- Damaged LF tone ring
- Excessive LF bearing play
- Corroded ABS module connector
Standard procedure
- Read all four wheel speeds on a roll test
- Test LF sensor resistance and output
- Inspect the tone ring and bearing play
- Check circuit wiring end to end
- Replace the sensor after circuit confirmation
Code lookup
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Sources and review
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Last updated 2026-09-25.
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This fault is part of the Ford ABS and traction control codes guide. It covers the family and the order to check it.