Dorman Knock Sensor and Harness Kit for Lexus/Toyota — 2 Sensors + Plug‑and‑Play Harness (926-387)

Complete knock sensor repair kit that replaces both sensors and the wiring harness for compatible Lexus and Toyota models.

If your check engine light is on or the engine is misfiring, a failing knock sensor or its wiring can be the culprit. The Dorman 926-387 kit delivers both knock sensors plus the matching harness so you can restore correct sensor input to the engine control unit without sourcing multiple parts. Designed to match original connector locations and electrical characteristics, this kit is meant as a direct replacement for select Lexus ES300, RX300 and a range of Toyota Camry, Highlander, Sienna and Solara model years.

How does this kit help fix a knocking or rough-running engine?

The sensors detect abnormal combustion (engine knock) and send signals to the vehicle’s computer to adjust ignition timing. Replacing both knock sensors and the harness eliminates common failure points—faulty sensor elements and damaged wiring—so the ECU receives accurate feedback again. Restoring correct sensor function helps the engine run closer to its designed timing strategy and can clear related diagnostic codes when the repair addresses the root cause.

• Includes two knock sensors to replace both cylinder-bank sensing points.
• Supplies the matched wiring harness to avoid splicing or aftermarket adapters.
• Connectors and terminal orientations match original equipment for plug-and-play fit.
• Addresses ECU misreads caused by open circuits, shorts, or degraded sensor output.

Will this kit fit my Lexus ES300, RX300 or Toyota model year?

The kit fits specific model years across Lexus ES300, RX300 and several Toyota models listed by year. Because trim and engine variations can affect compatibility, verify your exact fitment before purchase. Use the garage lookup or input make, model and trim to confirm this part number suits your vehicle.

• Compatible Lexus ES300: 1996–2003 and RX300: 1999–2003 years.
• Compatible Toyota Camry: 1994–2006, Highlander: 2001–2003, Sienna: 1998–2003, Solara: 1999–2003.
• Check vehicle trim and engine code in the garage tool for precise matching.

How straightforward is installation and what tools are needed?

This kit is designed for direct replacement—connectors and harness geometry match original parts to minimize modification. Basic hand tools and moderate mechanical skill are required for sensor access, which can vary by engine bay layout. If you’re comfortable removing intake components and using a torque wrench for sensor installation, the kit enables a quick repair compared with tracking down individual items.

• Plug-and-play harness requires no cutting, splicing, or rewiring.
• Common tools: ratchet set, sockets for sensor threads, pliers for clips, torque wrench.
• Access may require removal of intake covers or components on some models.
• Follow vehicle service manual torque specs when tightening sensors.

What quality and value does Dorman provide with this kit?

Dorman benchmarks its replacement parts to match original fit and function while offering cost advantages over dealer pricing. The kit’s components are tested to meet electrical and mechanical requirements typical of the factory parts they replace. For many owners, the combined sensor-and-harness approach reduces installation time and parts mismatch risk compared with buying sensors and harness separately.

• Manufactured to match original connectors and electrical characteristics.
• Sold as a complete set to avoid compatibility gaps between separate parts.
• Often offers savings versus OEM single-part purchases while supporting proper operation.
• Recommended to confirm fitment using your vehicle details before ordering.

Who is this for? The Dorman 926-387 kit is aimed at DIY mechanics and independent shops repairing late-1990s to early-2000s Lexus ES300 and RX300 or Toyota Camry, Highlander, Sienna and Solara vehicles that show knock-related fault codes or intermittent ignition timing issues. If you want a single, matched replacement that includes both sensors and the connecting harness for a cleaner, plug-and-play installation, this kit provides a convenient, cost-conscious option—just verify fitment to your exact model and engine before installation.