Speed sensor A

JPMEEKS

MEMBER
2004 TOYOTA MATRIX
4 CYL
4WD
AUTOMATIC
104,000 MILES

When you start the car the ABS and park lights are on. They do not go off until you move about one hundred feet or so. Sometimes engine light is on and not the ABS and park light. Hooked up scanner get an error code for speed sensor A. Brought car to local Toyota dealer, they hooked it up to diagnostic software, but could not find what was wrong. They wanted a open check book to find problem. Where is speed sensor A located? Also, would this cause issue with shifting?

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Oh yes, you can fix this yourself. Sensor A is the front left ABS wheel speed sensor I believe.

Here is a guide to help show you how to test the sensor:

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

This guide you give you an idea of what you are in for when doing the job:

https://www.2carpros.com/articles/how-to-replace-an-abs-wheel-speed-sensor

Here are diagrams to help you do the job on your car.

Also, check the wheel bearing which can cause the sensor not to work.

https://www.2carpros.com/articles/how-to-replace-a-cv-axle-bearing

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

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Speed sensor A

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