Walker 242-1397 Ignition Knock (Detonation) Sensor

Walker 242-1397 Ignition Knock Sensor

Walker 242-1397 is an OE replacement ignition knock sensor built to monitor engine vibration and detect detonation events. It helps the engine control unit adjust ignition timing in real time, supporting smoother operation and protecting internal engine components.

Key Features

• OE replacement knock sensor for gasoline engine applications
• Engineered for OE frequency range, sensitivity, and electrical output
• Spade terminal design with 1 rectangular female connector
• 2 male terminals for factory-style electrical connection
• Heat- and oil-resistant construction for engine-block environments
• Direct-fit replacement for original threaded sensor locations

Product Details

The Sensor Only line from Walker focuses on direct replacement engine management components, and this knock sensor follows that approach with OE-style fitment and calibrated signal response. Part number 242-1397 is tuned to recognize the resonant frequency associated with knock in the specified engine platform, allowing the ECU to reduce spark advance when detonation is detected. That helps maintain proper ignition control on vehicles such as the Chevrolet City Express and supports consistent drivability.

Compatible With 2015-2018 Chevrolet City Express, N/A. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Issues This Part Can Address

• Diagnostic trouble codes related to knock sensor performance, including P0325 and P0330
• Audible spark knock or detonation under load
• Incorrect ignition timing response from the ECU
• Reduced fuel economy caused by timing correction issues
• Drivability concerns tied to failed knock detection

Installation Notes and Tips

Install Walker 242-1397 in the original threaded sensor location and connect it using the factory-style terminal layout. Verify the connector shape, terminal type, and terminal count before installation, and inspect the mounting surface for corrosion, oil contamination, or damage that could affect sensor signal quality. After installation, clear any stored fault codes and confirm proper engine operation.

Quality Assurance

Walker knock sensors are built to match OE specifications for signal response and electrical output, with materials selected for heat and oil resistance in demanding engine environments. Part number 242-1397 is manufactured as an OE replacement sensor for direct-fit service on the listed application.