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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 it's really not. Restore engine performance with this brand new OEM replacement quality knock sensor for your vehicle. Vehicle Fitment: 2001-2004 Nissan Frontier 2.4L 2389CC l4 GAS DOHC 2000-2004 Nissan Sentra 1.8L 1809CC l4 GAS DOHC 2001-2003 Nissan Xterra 2.4L 2389CC l4 GAS DOHC