Standard Ignition KS525 Ignition Knock (Detonation) Sensor

Ignition Knock Sensor for Mercedes-Benz Applications

Standard Ignition KS525 is an ignition knock sensor built for direct-fit service on select Mercedes-Benz models. It uses a 2-terminal, female plug-in connector with an oval shape and bolt-mount attachment for a straightforward OE-style replacement.

Compatible with Mercedes-Benz AMG GT 43, AMG GT 53, CLS450, CLS53 AMG, E450, E53 AMG, GLE450, GLE53 AMG, GLS450, S500, and S580e applications, this Standard Ignition KS525 knock sensor supports accurate engine knock detection across a wide range of late-model vehicles.

Key Features

• Ignition knock (detonation) sensor for emission control and engine management systems
• Standard Ignition KS525 replacement part number
• 2-terminal blade design with 1 female connector
• Oval plug-in connector for OE-style electrical connection
• Bolt-mount attachment method for secure installation
• Plastic and metal construction for underhood durability
• Direct replacement for cross-reference applications

Detailed Description

The KS525 is designed as a bolt-mounted knock sensor that monitors engine vibration signals and sends data to the vehicle’s control system. On Mercedes-Benz AMG GT 53, E53 AMG, and GLS450 applications, a properly functioning knock sensor helps the engine management system respond to detonation-related conditions and maintain correct timing strategy. This part cross-references Mercedes-Benz OE 0009057304 for the same application.

Standard Ignition KS525 is a practical replacement choice when servicing Mercedes-Benz AMG GT 43, CLS53 AMG, E450, GLE53 AMG, S500, and S580e models that require a 2-terminal, oval plug-in sensor with a bolt-mount design.

What This Sensor Helps Address

• Knock sensor fault codes
• Engine pinging or detonation-related drivability concerns
• Reduced engine performance caused by inaccurate knock feedback
• Check engine light conditions tied to the knock sensor circuit
• Intermittent sensor signal issues from connector or mounting wear

Installation Notes and Tips

Verify connector style, terminal count, and mounting location before installation. The KS525 uses a female connector, male blade terminals, and bolt-mount attachment, so the replacement should match the original sensor configuration. Inspect the harness connector and mounting surface for corrosion, damage, or debris before securing the new sensor.

For best results, clear diagnostic trouble codes after installation and confirm proper operation with a scan tool if the vehicle previously stored knock sensor-related faults.

Quality Assurance

Standard Ignition supplies OE-style replacement electrical components for service applications, and KS525 is built to match the listed fitment and connector specifications for Mercedes-Benz vehicles.