Do these sensors come with new wiring harnesses or connectors?

The sensors ship as plug-and-play units. Your factory connectors will mate directly—no additional wiring harnesses included. If your vehicle's connectors are damaged or corroded, address that separately before installation.

Will my check engine light clear once I install these?

A faulty sensor code will clear after the new sensors are installed and the vehicle completes a full drive cycle. If the light returns or persists, a different issue is present—have the code read to confirm.

Can I install just one sensor, or do I need to replace both?

You can install one if only one sensor is faulty, but these are sold as a matched pair. For balanced engine performance and consistent emissions readings, both front sensors should be replaced together.