Dorman 42003 Ignition Knock (Detonation) Sensor Seal

Name: Dorman 42003 Ignition Knock (Detonation) Sensor Seal
Brand: Dorman
SKU: BCZF-42003
Price: 24.39 USD
Availability: InStock

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⚙️ 292 vehicles fit this part

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🚗Fitment: Buick, Chevrolet, GMC, Hummer, Cadillac, and Pontiac, Rainier, Express 1500, Express 2500, Express 3500, Silverado 1500 Classic, Silverado 1500 HD Classic, Trailblazer, Envoy, Savana 1500, Savana 2500, Savana 3500, Sierra 1500 Classic, Sierra 1500 HD Classic, H2, Escalade, Escalade ESV, Escalade EXT, Avalanche 1500, Silverado 1500, Silverado 1500 HD, Silverado 2500, Silverado 2500 HD, Silverado 3500, Suburban 1500, Suburban 2500, Tahoe, Sierra 1500, Sierra 1500 HD, Sierra 2500 HD, Sierra 3500, Yukon, Yukon XL 1500, Yukon XL 2500, GTO, CTS, Corvette, SSR, Trailblazer EXT, Envoy XL, Envoy XUV, Sierra 2500, Camaro, and Firebird

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Reliable Ignition Knock Sensor Seal for GM Vehicles

The Dorman 42003 Ignition Knock (Detonation) Sensor Seal is designed to provide a durable and precise seal for ignition knock sensors in various GM models. Crafted from elastomer material, this brown radial seal ensures a secure fit and reliable performance in emission control systems.

Constructed from high-quality elastomer for durability and flexibility
Brown color for easy identification during installation
Radial seal type with a round rim shape for optimal sealing
Dimensions: 0.77 inch inside diameter, 1.83 inch outside diameter, 0.3 inch thickness
Includes one grommet per package

Detailed Product Description

The Dorman 42003 ignition knock sensor seal is engineered to maintain a tight seal around the sensor, preventing contaminants from entering and ensuring accurate sensor readings. Its elastomer construction offers resistance to heat and chemical exposure common in engine compartments. The radial seal design with a round rim shape provides consistent sealing pressure, which is critical for the ignition knock sensor's function. This seal is compatible with a wide range of GM vehicles, including Buick, Cadillac, Chevrolet, GMC, Hummer, and Pontiac models such as the Chevrolet Silverado 1500, Cadillac Escalade, GMC Sierra 2500 HD, and Hummer H2.

Common Applications and Issues Addressed

Prevents sensor contamination from oil, dirt, and moisture
Maintains proper sensor alignment and sealing pressure
Helps avoid false knock sensor readings and engine performance issues
Reduces risk of emission control system malfunctions
Supports consistent ignition timing and engine efficiency

Installation Notes and Tips

Ensure the sensor mounting surface is clean and free of debris before installation
Verify the seal dimensions match the sensor and mounting location
Apply light lubrication if necessary to ease installation without damaging the elastomer
Inspect the seal for any damage or deformation before installing
Follow vehicle-specific service manual instructions for sensor removal and installation

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications, ensuring reliable fit and function. The 42003 ignition knock sensor seal undergoes rigorous quality control to provide consistent performance in emission control systems. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship.

Brand	Dorman
Part Number	42003
Color	Brown
Inside Diameter	0.77
Material	Elastomer
Outside Diameter	1.83
Package Contents	1 Grommet
Rim Shape	Round
Seal Type	Radial
Thickness	0.3

This part fits 292 vehicles. Search below:

Year	Make	Model	Liters	Cylinders	Position
2007	Buick	Rainier	5.3L	V8	N/A
2007	Chevrolet	Express 1500	5.3L	V8	N/A
2007	Chevrolet	Express 2500	6.0L	V8	N/A
2007	Chevrolet	Express 2500	4.8L	V8	N/A
2007	Chevrolet	Express 3500	6.0L	V8	N/A
2007	Chevrolet	Express 3500	4.8L	V8	N/A
2007	Chevrolet	Silverado 1500 Classic	5.3L	V8	N/A
2007	Chevrolet	Silverado 1500 Classic	6.0L	V8	N/A
2007	Chevrolet	Silverado 1500 Classic	4.8L	V8	N/A
2007	Chevrolet	Silverado 1500 HD Classic	6.0L	V8	N/A
2007	Chevrolet	Trailblazer	5.3L	V8	N/A
2007	GMC	Envoy	5.3L	V8	N/A
2007	GMC	Savana 1500	5.3L	V8	N/A
2007	GMC	Savana 2500	6.0L	V8	N/A
2007	GMC	Savana 2500	4.8L	V8	N/A
2007	GMC	Savana 3500	6.0L	V8	N/A
2007	GMC	Savana 3500	4.8L	V8	N/A
2007	GMC	Sierra 1500 Classic	5.3L	V8	N/A
2007	GMC	Sierra 1500 Classic	6.0L	V8	N/A
2007	GMC	Sierra 1500 Classic	4.8L	V8	N/A
2007	GMC	Sierra 1500 HD Classic	6.0L	V8	N/A
2007	Hummer	H2	6.0L	V8	N/A
2006	Cadillac	Escalade	6.0L	V8	N/A
2006	Cadillac	Escalade ESV	6.0L	V8	N/A
2006	Cadillac	Escalade EXT	6.0L	V8	N/A
2006	Chevrolet	Avalanche 1500	5.3L	V8	N/A
2006	Chevrolet	Express 1500	5.3L	V8	N/A
2006	Chevrolet	Express 2500	6.0L	V8	N/A
2006	Chevrolet	Express 2500	4.8L	V8	N/A
2006	Chevrolet	Express 3500	6.0L	V8	N/A
2006	Chevrolet	Express 3500	4.8L	V8	N/A
2006	Chevrolet	Silverado 1500	5.3L	V8	N/A
2006	Chevrolet	Silverado 1500	6.0L	V8	N/A
2006	Chevrolet	Silverado 1500	4.8L	V8	N/A
2006	Chevrolet	Silverado 1500 HD	6.0L	V8	N/A
2006	Chevrolet	Silverado 2500	5.3L	V8	N/A
2006	Chevrolet	Silverado 2500	4.8L	V8	N/A
2006	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2006	Chevrolet	Silverado 3500	6.0L	V8	N/A
2006	Chevrolet	Suburban 1500	5.3L	V8	N/A
2006	Chevrolet	Suburban 1500	6.0L	V8	N/A
2006	Chevrolet	Suburban 2500	6.0L	V8	N/A
2006	Chevrolet	Tahoe	5.3L	V8	N/A
2006	Chevrolet	Tahoe	4.8L	V8	N/A
2006	GMC	Savana 1500	5.3L	V8	N/A
2006	GMC	Savana 2500	6.0L	V8	N/A
2006	GMC	Savana 2500	4.8L	V8	N/A
2006	GMC	Savana 3500	6.0L	V8	N/A
2006	GMC	Savana 3500	4.8L	V8	N/A
2006	GMC	Sierra 1500	5.3L	V8	N/A
2006	GMC	Sierra 1500	6.0L	V8	N/A
2006	GMC	Sierra 1500	4.8L	V8	N/A
2006	GMC	Sierra 1500 HD	6.0L	V8	N/A
2006	GMC	Sierra 2500 HD	6.0L	V8	N/A
2006	GMC	Sierra 3500	6.0L	V8	N/A
2006	GMC	Yukon	5.3L	V8	N/A
2006	GMC	Yukon	6.0L	V8	N/A
2006	GMC	Yukon	4.8L	V8	N/A
2006	GMC	Yukon XL 1500	5.3L	V8	N/A
2006	GMC	Yukon XL 1500	6.0L	V8	N/A
2006	GMC	Yukon XL 2500	6.0L	V8	N/A
2006	Hummer	H2	6.0L	V8	N/A
2006	Pontiac	GTO	6.0L	V8	N/A
2005	Cadillac	CTS	5.7L	V8	N/A
2005	Cadillac	Escalade	5.3L	V8	N/A
2005	Cadillac	Escalade	6.0L	V8	N/A
2005	Cadillac	Escalade ESV	6.0L	V8	N/A
2005	Cadillac	Escalade EXT	6.0L	V8	N/A
2005	Chevrolet	Avalanche 1500	5.3L	V8	N/A
2005	Chevrolet	Express 1500	5.3L	V8	N/A
2005	Chevrolet	Express 2500	5.3L	V8	N/A
2005	Chevrolet	Express 2500	6.0L	V8	N/A
2005	Chevrolet	Express 2500	4.8L	V8	N/A
2005	Chevrolet	Express 3500	6.0L	V8	N/A
2005	Chevrolet	Express 3500	4.8L	V8	N/A
2005	Chevrolet	Silverado 1500	5.3L	V8	N/A
2005	Chevrolet	Silverado 1500	6.0L	V8	N/A
2005	Chevrolet	Silverado 1500	4.8L	V8	N/A
2005	Chevrolet	Silverado 1500 HD	6.0L	V8	N/A
2005	Chevrolet	Silverado 2500	5.3L	V8	N/A
2005	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2005	Chevrolet	Silverado 3500	6.0L	V8	N/A
2005	Chevrolet	Suburban 1500	5.3L	V8	N/A
2005	Chevrolet	Suburban 2500	6.0L	V8	N/A
2005	Chevrolet	Tahoe	5.3L	V8	N/A
2005	Chevrolet	Tahoe	4.8L	V8	N/A
2005	GMC	Savana 1500	5.3L	V8	N/A
2005	GMC	Savana 2500	5.3L	V8	N/A
2005	GMC	Savana 2500	6.0L	V8	N/A
2005	GMC	Savana 2500	4.8L	V8	N/A
2005	GMC	Savana 3500	6.0L	V8	N/A
2005	GMC	Savana 3500	4.8L	V8	N/A
2005	GMC	Sierra 1500	5.3L	V8	N/A
2005	GMC	Sierra 1500	6.0L	V8	N/A
2005	GMC	Sierra 1500	4.8L	V8	N/A
2005	GMC	Sierra 1500 HD	6.0L	V8	N/A
2005	GMC	Sierra 2500 HD	6.0L	V8	N/A
2005	GMC	Sierra 3500	6.0L	V8	N/A
2005	GMC	Yukon	5.3L	V8	N/A
2005	GMC	Yukon	6.0L	V8	N/A
2005	GMC	Yukon	4.8L	V8	N/A
2005	GMC	Yukon XL 1500	5.3L	V8	N/A
2005	GMC	Yukon XL 1500	6.0L	V8	N/A
2005	GMC	Yukon XL 2500	6.0L	V8	N/A
2005	Hummer	H2	6.0L	V8	N/A
2005	Pontiac	GTO	6.0L	V8	N/A
2004	Buick	Rainier	5.3L	V8	N/A
2004	Cadillac	CTS	5.7L	V8	N/A
2004	Cadillac	Escalade	5.3L	V8	N/A
2004	Cadillac	Escalade	6.0L	V8	N/A
2004	Cadillac	Escalade ESV	6.0L	V8	N/A
2004	Cadillac	Escalade EXT	6.0L	V8	N/A
2004	Chevrolet	Avalanche 1500	5.3L	V8	N/A
2004	Chevrolet	Corvette	5.7L	V8	N/A
2004	Chevrolet	Express 1500	5.3L	V8	N/A
2004	Chevrolet	Express 2500	5.3L	V8	N/A
2004	Chevrolet	Express 2500	6.0L	V8	N/A
2004	Chevrolet	Express 2500	4.8L	V8	N/A
2004	Chevrolet	Express 3500	6.0L	V8	N/A
2004	Chevrolet	Silverado 1500	5.3L	V8	N/A
2004	Chevrolet	Silverado 1500	6.0L	V8	N/A
2004	Chevrolet	Silverado 1500	4.8L	V8	N/A
2004	Chevrolet	Silverado 2500	5.3L	V8	N/A
2004	Chevrolet	Silverado 2500	6.0L	V8	N/A
2004	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2004	Chevrolet	Silverado 3500	6.0L	V8	N/A
2004	Chevrolet	SSR	5.3L	V8	N/A
2004	Chevrolet	Suburban 1500	5.3L	V8	N/A
2004	Chevrolet	Suburban 2500	6.0L	V8	N/A
2004	Chevrolet	Tahoe	5.3L	V8	N/A
2004	Chevrolet	Tahoe	4.8L	V8	N/A
2004	Chevrolet	Trailblazer	4.2L	L6	N/A
2004	Chevrolet	Trailblazer EXT	5.3L	V8	N/A
2004	GMC	Envoy XL	5.3L	V8	N/A
2004	GMC	Envoy XUV	5.3L	V8	N/A
2004	GMC	Savana 1500	5.3L	V8	N/A
2004	GMC	Savana 2500	5.3L	V8	N/A
2004	GMC	Savana 2500	6.0L	V8	N/A
2004	GMC	Savana 2500	4.8L	V8	N/A
2004	GMC	Savana 3500	6.0L	V8	N/A
2004	GMC	Savana 3500	4.8L	V8	N/A
2004	GMC	Sierra 1500	5.3L	V8	N/A
2004	GMC	Sierra 1500	6.0L	V8	N/A
2004	GMC	Sierra 1500	4.8L	V8	N/A
2004	GMC	Sierra 2500	6.0L	V8	N/A
2004	GMC	Sierra 2500 HD	6.0L	V8	N/A
2004	GMC	Sierra 3500	6.0L	V8	N/A
2004	GMC	Yukon	5.3L	V8	N/A
2004	GMC	Yukon	6.0L	V8	N/A
2004	GMC	Yukon	4.8L	V8	N/A
2004	GMC	Yukon XL 1500	5.3L	V8	N/A
2004	GMC	Yukon XL 1500	6.0L	V8	N/A
2004	GMC	Yukon XL 2500	6.0L	V8	N/A
2004	Hummer	H2	6.0L	V8	N/A
2004	Pontiac	GTO	5.7L	V8	N/A
2003	Cadillac	Escalade	5.3L	V8	N/A
2003	Cadillac	Escalade	6.0L	V8	N/A
2003	Cadillac	Escalade ESV	6.0L	V8	N/A
2003	Cadillac	Escalade EXT	6.0L	V8	N/A
2003	Chevrolet	Avalanche 1500	5.3L	V8	N/A
2003	Chevrolet	Corvette	5.7L	V8	N/A
2003	Chevrolet	Express 1500	5.3L	V8	N/A
2003	Chevrolet	Express 2500	5.3L	V8	N/A
2003	Chevrolet	Express 2500	6.0L	V8	N/A
2003	Chevrolet	Express 2500	4.8L	V8	N/A
2003	Chevrolet	Express 3500	6.0L	V8	N/A
2003	Chevrolet	Silverado 1500	5.3L	V8	N/A
2003	Chevrolet	Silverado 1500	6.0L	V8	N/A
2003	Chevrolet	Silverado 1500	4.8L	V8	N/A
2003	Chevrolet	Silverado 1500 HD	6.0L	V8	N/A
2003	Chevrolet	Silverado 2500	5.3L	V8	N/A
2003	Chevrolet	Silverado 2500	6.0L	V8	N/A
2003	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2003	Chevrolet	Silverado 3500	6.0L	V8	N/A
2003	Chevrolet	SSR	5.3L	V8	N/A
2003	Chevrolet	Suburban 1500	5.3L	V8	N/A
2003	Chevrolet	Suburban 2500	6.0L	V8	N/A
2003	Chevrolet	Tahoe	5.3L	V8	N/A
2003	Chevrolet	Tahoe	4.8L	V8	N/A
2003	Chevrolet	Trailblazer EXT	5.3L	V8	N/A
2003	GMC	Envoy XL	5.3L	V8	N/A
2003	GMC	Savana 1500	5.3L	V8	N/A
2003	GMC	Savana 2500	5.3L	V8	N/A
2003	GMC	Savana 2500	6.0L	V8	N/A
2003	GMC	Savana 2500	4.8L	V8	N/A
2003	GMC	Savana 3500	6.0L	V8	N/A
2003	GMC	Sierra 1500	5.3L	V8	N/A
2003	GMC	Sierra 1500	6.0L	V8	N/A
2003	GMC	Sierra 1500	4.8L	V8	N/A
2003	GMC	Sierra 1500 HD	6.0L	V8	N/A
2003	GMC	Sierra 2500	6.0L	V8	N/A
2003	GMC	Sierra 2500 HD	6.0L	V8	N/A
2003	GMC	Sierra 3500	6.0L	V8	N/A
2003	GMC	Yukon	5.3L	V8	N/A
2003	GMC	Yukon	6.0L	V8	N/A
2003	GMC	Yukon	4.8L	V8	N/A
2003	GMC	Yukon XL 1500	5.3L	V8	N/A
2003	GMC	Yukon XL 1500	6.0L	V8	N/A
2003	GMC	Yukon XL 2500	6.0L	V8	N/A
2003	Hummer	H2	6.0L	V8	N/A
2002	Cadillac	Escalade	5.3L	V8	N/A
2002	Cadillac	Escalade	6.0L	V8	N/A
2002	Cadillac	Escalade EXT	6.0L	V8	N/A
2002	Chevrolet	Avalanche 1500	5.3L	V8	N/A
2002	Chevrolet	Camaro	5.7L	V8	N/A
2002	Chevrolet	Corvette	5.7L	V8	N/A
2002	Chevrolet	Silverado 1500	5.3L	V8	N/A
2002	Chevrolet	Silverado 1500	4.8L	V8	N/A
2002	Chevrolet	Silverado 1500 HD	6.0L	V8	N/A
2002	Chevrolet	Silverado 2500	5.3L	V8	N/A
2002	Chevrolet	Silverado 2500	6.0L	V8	N/A
2002	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2002	Chevrolet	Silverado 3500	6.0L	V8	N/A
2002	Chevrolet	Suburban 1500	5.3L	V8	N/A
2002	Chevrolet	Suburban 2500	6.0L	V8	N/A
2002	Chevrolet	Tahoe	5.3L	V8	N/A
2002	Chevrolet	Tahoe	4.8L	V8	N/A
2002	GMC	Sierra 1500	5.3L	V8	N/A
2002	GMC	Sierra 1500	6.0L	V8	N/A
2002	GMC	Sierra 1500	4.8L	V8	N/A
2002	GMC	Sierra 1500 HD	6.0L	V8	N/A
2002	GMC	Sierra 2500	6.0L	V8	N/A
2002	GMC	Sierra 2500 HD	6.0L	V8	N/A
2002	GMC	Sierra 3500	6.0L	V8	N/A
2002	GMC	Yukon	5.3L	V8	N/A
2002	GMC	Yukon	6.0L	V8	N/A
2002	GMC	Yukon	4.8L	V8	N/A
2002	GMC	Yukon XL 1500	5.3L	V8	N/A
2002	GMC	Yukon XL 1500	6.0L	V8	N/A
2002	GMC	Yukon XL 2500	6.0L	V8	N/A
2002	Pontiac	Firebird	5.7L	V8	N/A
2001	Chevrolet	Camaro	5.7L	V8	N/A
2001	Chevrolet	Corvette	5.7L	V8	N/A
2001	Chevrolet	Silverado 1500	5.3L	V8	N/A
2001	Chevrolet	Silverado 1500	4.8L	V8	N/A
2001	Chevrolet	Silverado 1500 HD	6.0L	V8	N/A
2001	Chevrolet	Silverado 2500	5.3L	V8	N/A
2001	Chevrolet	Silverado 2500	6.0L	V8	N/A
2001	Chevrolet	Silverado 2500 HD	6.0L	V8	N/A
2001	Chevrolet	Silverado 3500	6.0L	V8	N/A
2001	Chevrolet	Suburban 1500	5.3L	V8	N/A
2001	Chevrolet	Suburban 2500	6.0L	V8	N/A
2001	Chevrolet	Tahoe	5.3L	V8	N/A
2001	Chevrolet	Tahoe	4.8L	V8	N/A
2001	GMC	Sierra 1500	5.3L	V8	N/A
2001	GMC	Sierra 1500	6.0L	V8	N/A
2001	GMC	Sierra 1500	4.8L	V8	N/A
2001	GMC	Sierra 1500 HD	6.0L	V8	N/A
2001	GMC	Sierra 2500	6.0L	V8	N/A
2001	GMC	Sierra 2500 HD	6.0L	V8	N/A
2001	GMC	Sierra 3500	6.0L	V8	N/A
2001	GMC	Yukon	5.3L	V8	N/A
2001	GMC	Yukon	6.0L	V8	N/A
2001	GMC	Yukon	4.8L	V8	N/A
2001	GMC	Yukon XL 1500	5.3L	V8	N/A
2001	GMC	Yukon XL 1500	6.0L	V8	N/A
2001	GMC	Yukon XL 2500	6.0L	V8	N/A
2001	Pontiac	Firebird	5.7L	V8	N/A
2000	Chevrolet	Camaro	5.7L	V8	N/A
2000	Chevrolet	Corvette	5.7L	V8	N/A
2000	Chevrolet	Silverado 1500	5.3L	V8	N/A
2000	Chevrolet	Silverado 1500	4.8L	V8	N/A
2000	Chevrolet	Silverado 2500	5.3L	V8	N/A
2000	Chevrolet	Silverado 2500	6.0L	V8	N/A
2000	Chevrolet	Suburban 1500	5.3L	V8	N/A
2000	Chevrolet	Suburban 2500	6.0L	V8	N/A
2000	Chevrolet	Tahoe	5.3L	V8	N/A
2000	Chevrolet	Tahoe	4.8L	V8	N/A
2000	GMC	Sierra 1500	5.3L	V8	N/A
2000	GMC	Sierra 1500	4.8L	V8	N/A
2000	GMC	Sierra 2500	5.3L	V8	N/A
2000	GMC	Sierra 2500	6.0L	V8	N/A
2000	GMC	Yukon	5.3L	V8	N/A
2000	GMC	Yukon	4.8L	V8	N/A
2000	GMC	Yukon XL 1500	5.3L	V8	N/A
2000	GMC	Yukon XL 2500	6.0L	V8	N/A
2000	Pontiac	Firebird	5.7L	V8	N/A
1999	Chevrolet	Camaro	5.7L	V8	N/A
1999	Chevrolet	Corvette	5.7L	V8	N/A
1999	Chevrolet	Silverado 1500	5.3L	V8	N/A
1999	Chevrolet	Silverado 1500	4.8L	V8	N/A
1999	Chevrolet	Silverado 2500	5.3L	V8	N/A
1999	Chevrolet	Silverado 2500	6.0L	V8	N/A
1999	GMC	Sierra 1500	5.3L	V8	N/A
1999	GMC	Sierra 1500	4.8L	V8	N/A
1999	GMC	Sierra 2500	5.3L	V8	N/A
1999	GMC	Sierra 2500	6.0L	V8	N/A
1999	Pontiac	Firebird	5.7L	V8	N/A
1998	Chevrolet	Camaro	5.7L	V8	N/A
1998	Chevrolet	Corvette	5.7L	V8	N/A
1998	Pontiac	Firebird	5.7L	V8	N/A
1997	Chevrolet	Corvette	5.7L	V8	N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

12558177

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.