Walker 242-1040 Ignition Knock (Detonation) Sensor

Walker 242-1040 Knock Sensor Overview

Walker Products 242-1040 is an ignition knock (detonation) sensor for select Toyota and Lexus applications. It is built to meet or exceed OEM standards and specifications, with application data supported by Walker’s engineering and product management resources.

Compatible With Toyota Tacoma, Tundra, 4Runner, Camry, Avalon, Sienna, Solara, Supra, T100, Previa, Corolla, and Lexus ES300, GS300, GS400, LS400, SC400, and RX300 applications across the listed model years.

Key Features

• Ignition knock (detonation) sensor for engine management systems
• Walker Products part number 242-1040
• Female connector with square connector shape
• 1 connector, 1 blade terminal, male terminal type
• No wiring harness included
• No mounting hardware included
• Length: 43.9000
• Backed by Walker Products’ ISO 9001/IATF16949 certified manufacturing environment

Product Details

Walker Products has supplied fuel system and engine management components since 1946, including sensors used in modern ignition control strategies. The 242-1040 knock sensor is intended for vehicles that rely on detonation feedback to help the engine control system manage spark timing under load. This part number is listed for Toyota Tacoma and Tundra, Toyota 4Runner and Camry, plus Lexus ES300, GS300, GS400, LS400, SC400, and RX300 applications in the fitment data. If you are replacing a failing Toyota Camry knock sensor or sourcing a Lexus ES300 ignition knock sensor, this part number provides an OE-style service replacement path.

This part cross-references Standard Ignition KS81 for the same application.

Common Problems This Part Can Address

• Knock sensor fault codes stored in the engine control module
• Audible spark knock or detonation under acceleration or load
• Reduced ignition timing control from a failed sensor signal
• Check engine light concerns related to knock sensor circuit performance
• Driveability issues on Toyota and Lexus engines using knock feedback

Installation Notes

Verify connector style, terminal configuration, and vehicle application before installation. The sensor uses a female square connector with a single blade terminal and does not include a wiring harness or mounting hardware. Follow the vehicle service procedure for access, torque, and connector routing, and inspect the harness and related engine management components during replacement. Confirm fitment for the exact year, make, and model before ordering Walker 242-1040.

Quality Assurance

Walker Products manufactures engine sensors and related fuel system components to meet or exceed OEM standards and specifications. The company supports production with in-house engineering, product management, and technical documentation, and operates under ISO 9001/IATF16949 certification.