ACDelco GM ignition knock sensor 213-3521
GM OEM ignition knock sensor. Detects detonation and helps adjust timing to protect the engine. Customers cite good fit and reliable performance, with some mixed results on check engine light behavior
Highlights
- GM OE replacement part
- detects detonation to adjust timing
- engine protection from pre-ignition
Pros
- direct replacement fit
- reliable ignition detonation sensing
- GM OE quality and durability
- helps protect engine from pre-ignition
Cons
- mixed feedback on check engine light behavior
- some concerns about OEM authenticity
- customer reports code return issues
Best For
Features
- Sends signals to the engine control module to adjust timing for proper operation
- Helps prevent engine damage from pre-ignition by monitoring detonation
- GM OE specification compliant replacement part for GM vehicles
