Dealer causes Check engine, Trac off, and 4wd light errors on RAV4 after shocks replaced.

after taking a 2012 RAV4 into the Toyota dealership to have them replace worn rear shock absorbers, the car then has traction control lights, four-wheel drive lights and check engine lights on. This was the fault of the dealer who was messing with other parts of the car when they were only supposed to be doing the shocks. I'll show you what caused it and how to fix it and diagnose it.