Ignition Knock (Detonation) Sensor

Part Number 242-91149 (117547788)

UPC: 724620203244

Package contents: 1 Each per Box

Select vehicle for guaranteed fit

Color

$49.23

Out of stock

Description

Walker Products Ignition Knock (Detonation) Sensors are OE Replacement components that monitor engine vibrations to detect knocking or detonation events. These sensors are a critical part of the engine control system, allowing the ECU to adjust ignition timing in real time to prevent spark knock—a condition that can cause internal engine damage, reduced fuel economy, and drivability issues. Walker Knock Sensors are engineered to match OE specifications for frequency range, sensitivity, and electrical output. Each unit is tuned to detect the specific resonant frequency of knock in a given engine platform, enabling precise spark retard when knock is detected. Built from high-quality, heat- and oil-resistant materials, these sensors are designed to endure the harsh conditions of the engine block and cylinder head. With exact OE fitment, Walker Knock Sensors install directly into the original threaded locations and connect using factory-style electrical terminals. Whether addressing a fault code (e.g., P0325, P0330), correcting timing issues, or replacing a failed sensor, Walker Knock Sensors restore proper knock detection, improve engine safety, and support optimal ignition performance across a wide range of gasoline applications.

Fitment

This part fits the following vehicles.

Chrysler

2004-2008 Crossfire

Mercedes-Benz

2001-2005 C240
1998-2000 C280
2001-2005 C320
2002-2004 C32 AMG
1998-2000 C43 AMG
2005-2006 C55 AMG
1998-2006 CL500
2001-2006 CL55 AMG
1998-1999, 2003-2014 CL600
2005-2006, 2008-2014 CL65 AMG
1998-2005 CLK320
1999-2003 CLK430
2003-2006 CLK500
2001-2006 CLK55 AMG
2006 CLS500
2006 CLS55 AMG
1998-2005 E320
1997 E420
1998-2002 E430
2003-2006 E500
1999-2006 E55 AMG
2002-2008 G500
2003-2011 G55 AMG
1998-2003 ML320
2003-2005 ML350
1999-2001 ML430
2002-2007 ML500
2000-2003 ML55 AMG
2006-2007 R500
2006 S350
1996-1999 S420
2000-2006 S430
1996-2006 S500
2001-2006 S55 AMG
1996-1999, 2003-2013 S600
2006-2013 S65 AMG
1997-2006 SL500
2003-2008 SL55 AMG
1997-2002, 2004-2009 SL600
2005-2009, 2011 SL65 AMG
2001-2004 SLK320
2002-2004 SLK32 AMG
2005-2010 SLK55 AMG
2005-2009 SLR McLaren

Features & benefits

OE Replacement Sensitivity: Calibrated to match factory frequency response and output for seamless ECU integration and spark control.
Built for Harsh Environments: Engineered to resist heat, vibration, and oil exposure for long-lasting signal reliability.
Restores Ignition Timing Accuracy: Supports optimal fuel efficiency, performance, and emissions by correcting spark advance during knock conditions.
Detects Engine Knock: Monitors vibration frequencies to detect detonation and prevent pre-ignition engine damage.
Exact OE Fit: Installs directly into original mounting locations using factory connectors and threads—no modifications required.
Direct replacement - this ignition knock sensor is made to match the fit, function and performance of the original equipment on specified vehicles
Ideal solution - engineered to detect vibrations from knock and other combustion problems and replace a knock sensor that has failed
Durable construction - designed and manufactured to strict specifications for reliable performance
Trustworthy quality - backed by a team of product experts in the United States and more than a century of automotive experience

Specifications

Connector Gender	Female
Connector Quantity	1
Connector Shape	Rectangle
Country Of Origin	CN
Length	44.810
Mounting Hardware Included	No
Street Legal	Yes
Terminal Gender	Male
Terminal Quantity	2
Terminal Type	Blade
Wiring Harness Included	No