New Car!! Sport Light Flashing

Good afternoon USMB friends:

Purchased a new Subaru to add to the fleet.

Picked up a 2005 Subaru Outback with 115k.   Is the LLBean Edition with 3.0 H6 with Automatic Transmission.

A needs some odds and ends.   The major reason the guy parted with it was the Sport light is flashing causing the transmission to shift at odd points. 

Only code is C0108.  I swapped out the left ABS Wheel Sensor.

My questions:

1) How do you reset the TCM codes?   Any recommendations on a scanner if I need to purchase a cheap one to do it?

2) Issue seemed to be resolved.   Got on it hard to see if problem would occur and hit rev limiter.   (Was in auto.)   Sport light began to flash.   Is this a related issue?   (Did not know why I hit rev limiter.) Would having exhaust off cause the issue? Video here: 

Any help would be appreciated.   

Tom