New Tires Solve ABS and Traction Control Lights

After having new front tires put on my car, I drove off the lot and my ABS and traction lights came on. I didn't really think the tire shop did anything, but i did ask them about it. They suggested that I take it to an indy shop and get the codes read. The guy at the shop said it was a right front front sensor, but warned me that it could be the ABS module.

So I got the car back to my house and put it on my ramps and tested both front wheel speed sensors. The passenger side showed an open even when I switched polarity. So I ordered a new VDO speed sensor.

In the mean time, I had 2 more tires mounted for the rear at the same tire shop. I drove off the lot and guess what? The lights went off. I heard that different size tires could cause a an ABS/Traction light, but this was the difference of about 50% tread depth. Not only that, I tested the wheel speed sensor about 20 times to make sure it was indeed open.

This goes to show that new tires mounted with worn tires can cause an ABS/ traction light. What is perplexing is that I tested that wheel speed sensor and it did show an open.
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