i have a 05 bonneville and the abs and check engine light is on i took it to auto zone and they said it was a speed senor.......so my question is if i get the sensor fix would the check engine light go off?????

Your Abs light Definatley will as long as its the issue..Was that the only issue their scanner brought up?

the hub and sensor so the check engine light wont go off

Do you know what code they scanned? For them to know your CEL is lit due to a wheel sensor they would require a Tech II scanner, and I don't think any Autozones carry those.

i read many threads on people with trouble with their speed sensor, as far as i know it wont set a check engine light, did they both come on at the exact same time?

I renamed your thread, to see if it gets more attention.

Generally, if a wheel speed sensor goes out, that'll usually set the Traction Off and ABS lights. Not sure about Check Engine.

We see this alot and a good many of them are fixed by merely taking the WSS wire coupling apart, and smearing some dielectric grease in the contacts. Always good to try this first.

A basic OBDII scanner won't read the ABS/Trac codes, which I think are Body codes. But I did get my Body codes read at my second Autozone. The first Autozone'* reader was broken and the sent me to the other Zone.

You are correct, you need an enhanced code reader to get body codes. And the wheel sensors are body codes.

On my wifes 2000 Buick Century the abs/traction and check engine lights all came on when the left front speed sensor went on the wheel bearing. All lights went off after bearing replaced.