Bosch 0261231040 Ignition Knock (Detonation) Sensor

Bosch Knock Sensor for Audi V8 Applications

This Bosch ignition knock sensor helps monitor engine detonation so the engine control system can adjust timing and protect performance. Built to OE quality standards, it supports smoother operation and can help reduce fuel consumption on the Audi A8, Audi A8 Quattro, and Audi V8 Quattro applications listed below.

Key Features

• Bosch OE quality ignition knock (detonation) sensor
• Helps detect engine knock for improved engine protection
• Supports fuel consumption reduction up to 9% per manufacturer data
• Direct-fit replacement for select Audi V8-platform applications
• Part number 0261231040 for accurate ordering and lookup

Product Details

The Bosch Ignition Knock (Detonation) Sensor, part number 0261231040, is an emission control sensor used to detect abnormal combustion events and send the signal needed for proper engine management. Bosch positions this sensor as an OE-quality replacement for vehicles that rely on precise knock detection to maintain drivability, protect internal engine components, and support efficient fuel use. This part cross-references Audi 077905377A for the same application.

Compatible With 1997-1999 Audi A8, left side; 1997-1999 Audi A8 Quattro, left side; and 1990-1994 Audi V8 Quattro. The brown color code and left-side application details should be matched to the original sensor location before installation. Bosch 0261231040 is a practical choice when replacing a failed knock sensor on Audi A8, Audi A8 Quattro, or Audi V8 Quattro models.

What It Helps Address

• Engine pinging or spark knock under load
• Check engine light related to knock sensor faults
• Reduced engine performance from incorrect ignition timing
• Fuel economy loss caused by inaccurate detonation feedback
• Driveability issues tied to failed engine knock detection

Installation Notes

Verify the left-side location and brown color code against the original part before installation. Inspect the connector, wiring, and mounting surface for damage or corrosion, and clear diagnostic trouble codes after replacement if required by the vehicle system. Confirm the application by year, model, and engine configuration before ordering.

Quality Assurance

Bosch OE-quality construction is used to support reliable knock detection and consistent engine management performance. This sensor is built for the listed Audi applications and follows Bosch’s original-equipment-focused approach to replacement parts.