Walker 242-91149 Ignition Knock (Detonation) Sensor

OE Knock Sensor for Mercedes-Benz Applications

Walker 242-91149 is an OE replacement ignition knock sensor built to monitor engine vibration and detect detonation events in real time. It helps the engine control unit adjust ignition timing quickly, supporting smoother operation and protecting internal engine components on Mercedes-Benz and Chrysler applications.

Walker Products Full Service Kit knock sensors are engineered for OE-style frequency range, sensitivity, and electrical output. This Walker 242-91149 sensor uses a 2-terminal blade connection with a rectangular female connector and direct-fit threaded mounting for factory-style installation.

Key Features

• OE replacement ignition knock (detonation) sensor
• Matches OE specifications for frequency range, sensitivity, and electrical output
• 2-terminal blade design with rectangular female connector
• Direct-threaded mounting location for factory-style fitment
• Heat- and oil-resistant construction for engine bay conditions
• Compatible with a wide range of Mercedes-Benz V8 and V12 applications, plus Chrysler Crossfire

Detailed Description

This ignition knock sensor is designed to detect spark knock by reading engine vibration patterns and sending the signal the ECU needs to adjust timing. On vehicles such as the Mercedes-Benz S500, E320, CL500, SL500, and G500, accurate knock detection helps maintain proper ignition control and reduces the risk of detonation-related damage. The Walker 242-91149 is tuned for the resonant frequency of the engine platform it serves, which supports precise spark retard when knock is present.

This part cross-references Bosch 0261231110 and Standard Ignition KS184 for the same application. It is a direct replacement choice for drivers servicing Mercedes-Benz CL600, S600, SL55 AMG, and related models listed in the fitment data.

What It Helps Address

• Knock sensor fault codes such as P0325 and P0330
• Erratic ignition timing caused by inaccurate knock detection
• Spark knock or detonation under load
• Reduced fuel economy from incorrect timing correction
• Drivability concerns tied to failed engine vibration sensing

Installation Notes and Tips

Install the sensor in the original threaded location and connect it using the factory-style 2-pin blade terminal interface. Verify connector condition, wiring integrity, and mounting surface cleanliness before installation. Because this sensor is used in engine-block and cylinder-head environments, proper torque and secure electrical contact are important for accurate signal transfer.

Compatible With 1996-2014 Mercedes-Benz CL600, S600, SL500, E320, ML320, G500, and related applications; also fits 2004-2008 Chrysler Crossfire. Fitment includes Mercedes-Benz CL65 AMG, S65 AMG, SL55 AMG, C32 AMG, and other listed models across the 1996-2014 range.

Quality Assurance

Walker Products builds this knock sensor as an OE replacement component for gasoline engine management systems, with materials selected to withstand heat and oil exposure in demanding engine locations. The design follows factory-style fitment and signal characteristics to restore proper knock detection on supported Mercedes-Benz and Chrysler applications.