Walker 242-91039 Ignition Knock (Detonation) Sensor

Walker Products Knock Sensor 242-91039

Walker Products FSK 242-91039 is an ignition knock sensor for select GM trucks, SUVs, and performance cars from 1998-2007. It is built to meet or exceed OEM standards and specifications, with engineering and application support backed by Walker Products’ long-running aftermarket experience.

Key Features

• Ignition knock (detonation) sensor for engine management systems
• Walker Products FSK product line for OE-style replacement applications
• Built to Walker Products’ OEM-level standards and specifications
• Supported by in-house manufacturing, engineering, and product management
• ISO 9001 / IATF16949 certified manufacturing environment

Product Details

This Walker Products knock sensor, part number 242-91039, is used to monitor engine vibration and detonation signals so the engine control system can adjust timing as needed. It is a direct-fit style replacement for many Chevrolet, GMC, Cadillac, Hummer, Buick, Pontiac, and Isuzu applications, including Silverado 1500, Sierra 1500, Tahoe, Yukon, Escalade, Corvette, and H2 models. This part cross-references Standard Ignition KS36 and KS116 for the same application.

What It Helps Address

• Knock sensor fault codes
• Engine pinging or detonation-related drivability concerns
• Reduced ignition timing control from a failing sensor
• Check engine light conditions tied to knock sensor circuit issues
• Intermittent performance problems on GM truck and SUV applications

Installation Notes and Tips

Verify the exact year, make, and model before ordering, since this part covers multiple GM platforms and some applications note design differences. For example, 1998 Camaro, Corvette, and Firebird use the second design without a locating tab, and 2003 Sierra 1500 notes OE part number 10456031. Confirm connector style, sensor location, and engine configuration against the vehicle service information before installation.

Quality Assurance

Walker Products has supplied fuel system and engine management components since 1946 and manufactures this sensor to meet or exceed OEM requirements. The company supports its parts with engineering, technical documentation, and application data, and its facilities operate under ISO 9001 / IATF16949 certification.