C1258 Left Front Brake Sensor Output

POSSIBLE SOURCE(S):
- Damaged/missing left front brake antilock sensor indicator teeth or missing left front brake antilock sensor indicator.
- Weak left front brake antilock sensor.
- Air gap too small or too large.
- Shorted left front brake antilock sensor.
- Excessive axle vibration.
- Loose left front brake antilock sensor in wheel end.
- Intermittent short or open in Circuit 521 (T/O) or 522 (T/BK).
- Disturbances caused by ignition or radio frequency interference.
- Defective trigger circuit in antilock brake control module.

ACTION(S) TO TAKE:
- Go to Pinpoint Test K.