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Symptoms of a bad knock sensor include a sluggish engine poor acceleration and poor fuel economy. Knock sensors rarely fail outright and more often get "soft" over time and cause false signals to be sent to the ECU which thinks the engine is knocking when its really not. Restore engine performance with this brand new OEM replacement quality knock sensor for your Nissan or Infiniti. AIP develops, manufactures and markets a comprehensive line of OEM replacement/high performance products and systems, distributed through a nationwide network of dealerships, online marketplaces, service facilities, and wholesale warehouses. ** Factory Replacement Part that Meets or Exceeds Original Manufacturer Specifications for the Vehicles Listed.