Will this throw a check engine light if my old sensor is bad?

No—replacing a failing O2 sensor clears the fault condition once the new sensor reads steady voltage to the ECU. If the light returns after install, the problem lies elsewhere in the fuel or emissions system.

Do I need any special tools or an oxygen sensor socket to install this?

An O2 sensor socket (usually 22mm or 7/8") makes removal and installation easier, but a wrench works if you have clearance. The sensor threads directly into the exhaust manifold or downpipe—no adapters needed.

Can I install this myself, or do I need a shop?

DIY installation is straightforward if you're comfortable working around the exhaust. Disconnect the sensor electrical connector, unscrew the old sensor, thread in the new one, and reconnect. Let the exhaust cool first.