Will this trigger any warning lights on my dashboard?

Not if it's in good working condition. A faulty sensor is usually what causes check engine lights in the first place. This replacement should clear that code once installed and the system resets.

Do I need any special tools to swap this out?

Basic hand tools and a sensor socket (if applicable to your specific sensor type) are typical. Your vehicle's service manual will show exact removal and torque specs for your model year.

How do I know which sensor I actually need?

Sensor type varies by engine and model. Pull your VIN or check your owner's manual for the specific sensor location and part number. Once you confirm the type, this part will fit direct to OEM specs.