ACDelco 213969 Knock Detonation Sensor OE Replacement

The ACDelco 213969 is a professional-grade knock (detonation) sensor designed as a direct OE replacement for select GM vehicles. This sensor monitors engine combustion and detects abnormal detonation events — commonly known as engine knock or ping — relaying that signal to the engine control module (ECM) so ignition timing can be adjusted in real time to protect engine integrity and optimize performance.

Key Features:

• Direct OE replacement designed to meet original equipment specifications
• Detects engine knock and detonation to protect against internal engine damage
• Sends voltage signal to the ECM for precise ignition timing correction
• Manufactured by ACDelco, GM's trusted OEM parts division
• Designed for easy, straightforward installation as a plug-and-play replacement
• Helps maintain fuel efficiency and engine performance by preventing over-advanced timing

ACDelco Professional sensors are engineered to match the fit, form, and function of the original factory part. The 213969 knock sensor is a reliable solution for restoring proper engine management function when the original sensor has failed, often indicated by a check engine light with diagnostic trouble codes such as P0325, P0326, P0327, or P0328.