Check engine and traction light stays on

Check the wiring going to the sensor. Maybe it got damaged during the engine replacement. As for the traction control problem, same deal. He needs to be able to pull the trouble code out of that computer to see what's going on. On a side note, I wouldn't put too much more money into this vehicle. It's 9 years old and so many times I've seen people do a major repair like this to an older model thinking they're saving money and wind up with a boatload of troubles afterwards!! Hope that helps! Jim