Bosch 0261231218 Ignition Knock (Detonation) Sensor

Bosch Knock Sensor for Engine Protection

Bosch 0261231218 is an OE-quality ignition knock sensor built to help the engine control system detect detonation and adjust timing as needed. It supports smoother operation, better fuel use, and protection against knock-related engine damage.

Key Features

• Bosch ignition knock (detonation) sensor for emission control and engine management systems
• OE-quality construction for consistent signal output
• Metal and plastic housing for durability in engine bay conditions
• Rectangular male connector with blade terminals
• Bolt-on mounting style for direct sensor installation
• Connector quantity: 1; terminal quantity: 2
• Wiring harness not included

Product Details

This Bosch knock sensor, part number 0261231218, is used to monitor engine vibration patterns associated with spark knock or detonation. When the engine control module receives the sensor signal, it can make timing corrections to help protect the engine and maintain efficient combustion. Bosch states this OE-quality design can support fuel consumption reduction of up to 9% when the system is operating as intended. This part cross-references 270000484 for the same application.

What It Helps Address

• Knocking or pinging under load
• Check engine light related to knock sensor circuit faults
• Reduced fuel economy caused by incorrect ignition timing
• Loss of power from detonation-related timing retard
• Rough engine operation tied to inaccurate knock detection

Installation Notes

Verify connector shape, terminal type, and bolt-on mounting location before installation. The sensor uses a rectangular male connector with blade terminals and does not include a wiring harness. For best results, inspect the mounting surface and wiring condition before replacing the sensor. Fits select vehicle applications; confirm exact year, make, model, and engine configuration against the catalog listing before ordering. Compatible With Bosch knock sensor applications for select Volkswagen Golf, Volkswagen Jetta, and Audi A4 engine management systems where this part number is specified.

Quality Assurance

Bosch OE-quality construction is intended to meet the demands of factory-style engine management systems. Part number 0261231218 is built for dependable knock detection and consistent signal performance in the specified application.