Is this a direct-fit sensor or a universal one?

It is direct fit. The connector matches the factory plug and the 21.26-inch lead follows the original routing, so no cutting or crimping is needed.

How do I know it fits my car?

Fit depends on the part number, not the brand alone. Check that 234-4122 is listed for your vehicle's year, engine and sensor position (upstream or downstream) before ordering.

Does it come with the connector and wiring?

Yes. The sensor is sold as a complete assembly with its four-wire harness and factory-style connector attached.

Will it clear my check-engine light?

It will if the code points to a failed oxygen sensor on a compatible vehicle. If the code comes from a wiring fault, an exhaust leak or a rich-running condition, replacing the sensor alone won't clear it.

Can I install it myself?

Many owners do. You need an oxygen sensor socket or a wrench, and on older cars the old sensor can be seized, so penetrating oil and a warm engine help.