* Steering components damaged during engine removal/installation: The engine and transmission are quite close to steering components like the steering rack, tie rods, and power steering lines. If the mechanic isn't careful, these parts could be bumped, bent, or even broken during the engine removal or installation process.
* Power steering lines disconnected and not properly reconnected: Power steering lines run through the engine bay and need to be disconnected to access the engine. If these aren't properly reconnected or if air gets into the system, the power steering will malfunction, resulting in difficult steering. A leak could also develop.
* Incorrect torque specifications: Various bolts and nuts securing steering components might need to be tightened or loosened during the engine replacement. Using incorrect torque specifications can damage these components or lead to loose connections.
* Damage to the steering column: While less likely, damage to the steering column is possible, particularly if the mechanic is using improper lifting techniques or if there's a collision between the steering column and engine during the process.
It's important to note that a competent mechanic should take precautions to avoid these issues, but mistakes can happen. If you experience steering problems after an engine replacement, it's crucial to return to the mechanic and have them diagnose and fix the problem. They should be responsible for correcting any issues caused by their work.