ABS Light - No Code 2000 Avalon

[Snaglpuss]

Changed the left rear ABS sensor on my wife's Avalon.

The ABS light when out and stayed out for about 1 1/2 weeks.

Light came on again for a day, stayed out for a couple of days.

Light is on again for almost a week.

Put on a Harbor Freight code reader, no stored codes.

Any ideas? How can I clear the light and / or find out what is causing
the light to reappear?

Thanks

[Snaglpuss]

I fixed it.

I jumpered the Tc & E1 Terminals in the under the hood Data Link Connector to try to get the ABS Light to blink out a code since the OBD reader didn't have one.

I got code 39- LH Rear Speed Sensor Open Circuit.

This was the sensor I changed.

I pulled the back seat so I could get to the connector at the wiring harness so I could check the sensor with a meter.
When I got the top cushion out I noticed the conector wasn't snapped in all the way. It must have gotten partially unplugged when I put the cushion back in the first time and eventually disconnected itself.

I guess when all else fails check the obvious.

Thanks to all who at least looked at my post.