Standard Ignition S3091 Ignition Knock (Detonation) Sensor Harness

Ignition Knock Sensor Harness for Toyota and Lexus

Standard Ignition S3091 is an ignition knock sensor harness built for select Toyota and Lexus applications. It uses a weatherproof sealed design with 18-gauge wiring and OE-style connector layouts to support a secure electrical connection in the engine bay.

Key Features

• Part number S3091 ignition knock (detonation) sensor harness
• Fits select Lexus ES350, RX350, RX450h and Toyota Highlander, Venza, RAV4, Camry, Sienna, and Avalon applications
• 35 cm harness length with 14-inch overall length
• 18-gauge wire construction with 4-wire layout
• 3 connectors with female and male terminals
• Rectangle and square connector shapes for application-specific fitment
• Weatherproof sealed construction

Detailed Description

Standard Ignition S3091 is an ignition knock sensor harness designed for direct replacement use on a range of Toyota and Lexus vehicles. It features a 350 mm harness length, 18-gauge wire, and a sealed connector design to maintain a dependable electrical path between the knock sensor and the engine control system. This part number is commonly searched as S3091 for Toyota Highlander, Toyota Camry, and Lexus RX350 knock sensor harness replacement needs.

This part cross-references ACDelco PT3868 for the same application.

What It Helps Address

• Broken, brittle, or heat-damaged knock sensor wiring
• Intermittent detonation sensor signal loss
• Connector fitment issues caused by worn terminals
• Engine warning lights related to knock sensor circuit faults
• Driveability problems tied to unstable sensor communication

Installation Notes and Tips

Verify connector shape, terminal style, and harness routing before installation. Confirm the vehicle application by year, make, and model, especially on Lexus ES350, Toyota Highlander, and Toyota RAV4 platforms. Inspect adjacent wiring, clips, and sensor connectors for heat damage or corrosion before connecting the new harness.

Quality Assurance

Standard Ignition supplies replacement ignition and electrical components for service applications. S3091 is built with sealed connector construction and application-specific terminal configuration to support consistent fitment on listed Toyota and Lexus vehicles.