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.** Factory Replacement Part that Meets or Exceeds Original Manufacturer Specifications for the Vehicles Listed.2005-2006 Isuzu Ascender 4.2L 256Cu. In. l6 GAS DOHC2003-2005 Isuzu Ascender 5.3L 323Cu. In. V8 GAS OHV VIN: P2002-2005 Chevrolet Avalanche 1500 5.3L 323Cu. In. V8 GAS OHV VIN: T2006 Chevrolet Avalanche 1500 5.3L 5328CC 325Cu. In. V8 FLEX OHV VIN: Z2005 Chevrolet Avalanche 1500 5.3L 323Cu. In. V8 FLEX OHV VIN: Z1998-2002 Chevrolet Camaro 5.7L 350Cu. In. V8 GAS OHV (2nd Design w/o Locating Tab); VIN: G1998-2004 Chevrolet Corvette 5.7L 350Cu. In. V8 GAS OHV (2nd Design w/o Locating Tab); VIN: G2003-2004 GMC Envoy 5.3L 323Cu. In. V8 GAS OHV VIN: P2002-2005 Cadillac Escalade 5.3L 325Cu. In. V8 GAS OHV VIN: T2002-2005 Cadillac Escalade 6.0L 5967CC 364Cu. In. V8 GAS OHV VIN: N2003 Chevrolet Express 1500 5.3L 323Cu. In. V8 GAS OHV VIN: T2004-2006 Chevrolet Express 1500 4.3L 262Cu. In. V6 GAS OHV VIN: X2003 Chevrolet Express 2500 5.3L 323Cu. In. V8 GAS OHV VIN: T2003-2006 Chevrolet Express 2500 4.8L 294Cu. In. V8 GAS OHV VIN: V2004 Chevrolet Express 2500 4.3L 262Cu. In. V6 GAS OHV VIN: X2003 Chevrolet Express 2500 6.0L 5967CC 364Cu. In. V8 GAS OHV VIN: U2003-2006 Chevrolet Express 3500 6.0L 5967CC 364Cu. In. V8 GAS OHV VIN: U2006 Chevrolet Express 3500 4.8L 294Cu. In. V8 GAS OHV VIN: V1998-2002 Pontiac Firebird 5.7L 350Cu. In. V8 GAS OHV (2nd Design w/o Locating Tab); VIN: G2004 Pontiac GTO 5.7L 350Cu. In. V8 GAS OHV2003-2005 Hummer H2 6.0L 5967CC 364Cu. In. V8 GAS OHV VIN: U2004 Buick Rainier 4.2L 256Cu