Walker 242-1277 Ignition Knock (Detonation) Sensor

OE Knock Sensor for Engine Timing Control

Walker 242-1277 is an OE replacement ignition knock sensor built to monitor engine vibration and report detonation events to the ECU. It helps the engine computer adjust ignition timing in real time, supporting smoother operation and protecting internal components from spark knock.

This Sensor Only line from Walker focuses on direct-fit replacement sensors engineered for factory-style electrical connection and OE-style signal output. For drivers searching for a Mercedes-Benz C230 knock sensor, Mercedes-Benz S320 knock sensor, or Saturn Astra knock sensor replacement, Walker 242-1277 provides the sensor element needed to restore knock detection.

Key Features

• OE replacement ignition knock (detonation) sensor
• Terminal type: spade
• Connector quantity: 1
• Connector shape: rectangle
• Terminal quantity: 2
• Connector gender: female
• Terminal gender: male
• Built with heat- and oil-resistant materials for engine-bay conditions
• Engineered for OE-style frequency range, sensitivity, and electrical output

Product Details

Walker Products 242-1277 is calibrated to detect the resonant frequency associated with knock in specific engine platforms, allowing the ECU to reduce spark advance when detonation is present. That makes it a practical replacement for vehicles showing knock sensor fault codes or timing-related drivability concerns. This part cross-references Bosch 0261231188 for the same application.

Compatible With 2008 Saturn Astra, N/A; 1997-2000 Mercedes-Benz C230, N/A; 1998-2000 Mercedes-Benz SLK230, N/A; 1996-1999 Mercedes-Benz S320, N/A; 1996-1997 Mercedes-Benz C280, N/A; 1995-1997 Mercedes-Benz C36 AMG, N/A; 1996-1997 Mercedes-Benz E320, N/A; 1996-1997 Mercedes-Benz SL320, N/A; and 1996 Mercedes-Benz C220, N/A. Walker 242-1277 is also a direct search match for Mercedes-Benz C230 knock sensor and Mercedes-Benz E320 knock sensor replacement needs.

Common Issues This Part Can Address

• Knock sensor fault codes such as P0325 or P0330
• Audible spark knock or detonation under load
• Incorrect ignition timing response from the ECU
• Reduced fuel economy caused by timing retard
• Drivability problems related to failed knock detection

Installation Notes

Install Walker 242-1277 in the original threaded sensor location and connect it using the factory-style terminal interface. Verify connector shape, terminal count, and engine application before installation, especially on Mercedes-Benz C230, Mercedes-Benz S320, and Saturn Astra applications. Clear stored diagnostic trouble codes after replacement and confirm that the knock sensor signal is being read correctly by the engine control system.

Quality Assurance

Walker Products builds this sensor as an OE replacement component with specifications matched for frequency response, sensitivity, and electrical output. The design uses materials selected to withstand heat and oil exposure in the engine block and cylinder head area.