The knock sensor fits 2011-2021 BMW vehicles. It is 1.74 in. long. It has a male rectangle connector with 2 pin terminals.

Delphi AS10251 Knock Sensor Features:

• Fits 2011-2021 BMW Applications
• Calibrated for a wide variety of frequencies to detect shifts, and adjust to provide accurate signals to help maximize engine performance.
• The knock sensors are sealed to withstand humidity, salt spray, and automotive fluids.
• Ground isolated design with 2 wire shielded harness helps protect the sensor signal from electro magnetic interference.
• Self generating piezoelectric design requires no power to the sensor.
• The electrical connector is male and rectangle in shape.
• Knock sensors help maximize engine performance with all fuels.
• Knock sensors prevent against engine damage from pre ignition knocking.