ABS/VSC/Traction control codes but no dash lights.

Hey folks, a good buddy of mine is looking to get a taco, we went to look at one and took it to a shop for a look over. When they plugged a scan tool into it it was showing the following current codes:
- Yaw rate sensor
- Low output signal for all 4 speed sensors
- Abnormal change In output signal for all 4 speed sensors
- Master cylinder pressure sensor output abnormal
- Center differential lock position switch

The odd thing is, there are no lights on the dash. All stability and traction related systems appear to function normally, 4wd hi and lo work as they should, and all lights cycle as they should.

Anybody have any similar experiences? The shop was baffled, they said occasionally vehicles will throw erroneous codes just because of the scan tool being plugged in. All codes immediately returned when cleared, but dash lights stayed off.

Edit: truck is a 2009 access cab 2.7L 5spd 4x4

 

That's a tough one. While I'm not aware of vehicles just throwing erroneous codes, I'd be hesitant to own this truck. Even if there's nothing wrong with the truck, there's something wrong with erroneous codes being thrown and I wouldn't want that.