Walker 242-1236 Ignition Knock (Detonation) Sensor

Ignition Knock Sensor for Mercedes-Benz Applications

Walker 242-1236 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 when knock is present, supporting smoother operation and helping protect internal engine components.

Compatible With select Mercedes-Benz and Dodge Sprinter applications, including Mercedes-Benz C300, E350, ML350, S550, and related models from 2005-2015. This Sensor Only line from Walker focuses on direct-fit replacement sensors for factory-style service.

Key Features

• OE replacement ignition knock (detonation) sensor
• Engine vibration monitoring for knock detection
• Matched for frequency range, sensitivity, and electrical output
• Heat- and oil-resistant construction for engine bay conditions
• Direct-fit threaded mounting location with factory-style electrical connection
• Black plastic housing with 1 bolt hole, 1 connector, and 2 terminals
• Walker 242-1236 cross-references Bosch 0261231188 for the same application

Product Details

Walker Sensor Only parts are focused replacement components for vehicles that need a precise sensor match rather than a complete harness or accessory assembly. Part number 242-1236 is engineered to replicate OE sensor behavior so the ECU receives the correct signal when knock occurs. That signal allows timing correction in real time, which is important for Mercedes-Benz engines that rely on accurate detonation control for drivability and engine protection.

This part number 242-1236 is used across a wide range of Mercedes-Benz models, including C63 AMG, GL550, E550, ML63 AMG, and SLK350 applications. It is also listed for 2007-2008 Dodge Sprinter 2500 and Sprinter 3500 models.

Common Issues This Sensor Can Address

• Knock sensor fault codes such as P0325 or P0330
• Incorrect ignition timing response during detonation events
• Engine pinging or spark knock under load
• Reduced drivability caused by a failed knock sensor signal
• Loss of proper ECU knock detection on Mercedes-Benz and Sprinter applications

Installation Notes and Tips

Install Walker 242-1236 in the original threaded sensor location and connect it using the factory-style terminal interface. Verify connector shape, terminal count, and mounting style before installation. Because no gasket, seal, wiring harness, mounting bracket, or hardware is included, reuse or source any vehicle-specific components required by the application.

For best results, clear diagnostic trouble codes after installation and confirm that the engine control system is reading the new sensor correctly. Always match the part to the exact vehicle year, make, and model listed in the fitment data.

Quality Assurance

Walker builds this knock sensor to OE replacement standards using materials selected for heat and oil exposure near the engine block and cylinder head. The sensor is tuned for the specified resonant frequency range so it can deliver the signal expected by the factory engine management system.