How to Find the ABS Tone Sensor in a 1998 Subaru Legacy

In the antilock brake system of a 1998 Subaru Legacy, the tone sensor detects the speed of each wheel while braking. If the speed of one wheel falls below that of the other wheels, the antilock mechanism engages. The tone sensor is attached facing the tone wheel, allowing it to measure the wheel's speed.

Instructions

1

Raise the front of your car with the jack. Your service manual will specify safe jack points.

2

Lower the car onto jack stands. Never work under a car supported only by a jack.

3

Crawl under the front end of the car with the flashlight. Find where the right tie-rod and control arm attach to the front wheel; this is the steering knuckle.

4

The tone sensor is attached via a retaining bolt to the steering knuckle, roughly halfway between the ball joint and the tie-rod end.

5

Locate the left front tone sensor in the same fashion.

6

Lower your vehicle from the jack stands and raise the back end up with the jack, placing it onto jack stands.

7

Crawl under the back end of the car with the flashlight and locate the rear knuckles.

8

The rear tone sensors will be located directly above where the front control arms attach to the knuckles.