What should you check if a vehicle pulls to one side while driving?

When a vehicle pulls to one side while driving, it is crucial to check tire pressure discrepancies and alignment. Proper tire pressure is vital for balanced handling and steering. If one tire is significantly underinflated compared to others, it can cause the vehicle to drift or pull toward that side.

Additionally, the vehicle's alignment plays a key role in ensuring that all four wheels point in the same direction. Misalignment can lead to uneven tire wear and pulling to one side while driving, making it necessary to check the alignment angles such as camber, caster, and toe.

The other options relate to different aspects of vehicle maintenance. While engine oil pressure and temperature, battery connections, and brake fluid levels are essential for overall vehicle operation and safety, they do not directly address the specific issue of a vehicle pulling to one side during driving.