Walker Products Ignition Knock Detonation Sensor - 242-91051

Walker Products Ignition Knock Detonation Sensor - 242-91051

SKU: WPR-242-91051

Walker Products

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If provided, we'll verify fitment before your order ships and contact you if the selected part is incompatible. Enter your VIN, then add the product to your cart.

Product details

Part Name Ignition Knock Detonation Sensor
Brand Walker Products
Part Number 242-91051
UPC 00724620126710

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Fitment is guaranteed:

If your vehicle is listed on the fitment table below, the product will fit your car - we guarantee it. All you need to do is to ensure that the vehicle's Year, Make, Model, Trim, and any other notes specified inside the fitment table are respected.

Included warranty:

For warranty coverage information, please see our Warranty Policy.

Warranty starts from the date of delivery.
Proof of purchase required for all claims.
Covers manufacturing defects only.
Does not cover normal wear & tear.
Does not cover cosmetic damage or rust damage.

To initiate a claim, simply send an email to support@partspioneer.ca. For more information, read our Warranty Policy.

Choose Walker Products because:

Walker Products Ignition Knock (Detonation) Sensors are OE Replacement components that monitor engine vibrations to detect knocking or detonation events. These sensors are a critical part of the engine control system, allowing the ECU to adjust ignition timing in real time to prevent spark knock—a condition that can cause internal engine damage, reduced fuel economy, and drivability issues. Walker Knock Sensors are engineered to match OE specifications for frequency range, sensitivity, and electrical output. Each unit is tuned to detect the specific resonant frequency of knock in a given engine platform, enabling precise spark retard when knock is detected. Built from high-quality, heat- and oil-resistant materials, these sensors are designed to endure the harsh conditions of the engine block and cylinder head. With exact OE fitment, Walker Knock Sensors install directly into the original threaded locations and connect using factory-style electrical terminals. Whether addressing a fault code (e.g., P0325, P0330), correcting timing issues, or replacing a failed sensor, Walker Knock Sensors restore proper knock detection, improve engine safety, and support optimal ignition performance across a wide range of gasoline applications.

Characteristics include:

Built for Harsh Environments: Engineered to resist heat, vibration, and oil exposure for long-lasting signal reliability.
OE Replacement Sensitivity: Calibrated to match factory frequency response and output for seamless ECU integration and spark control.
Exact OE Fit: Installs directly into original mounting locations using factory connectors and threads—no modifications required.
Detects Engine Knock: Monitors vibration frequencies to detect detonation and prevent pre-ignition engine damage.
Restores Ignition Timing Accuracy: Supports optimal fuel efficiency, performance, and emissions by correcting spark advance during knock conditions.

Customer Video Reviews

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Fitment Table

This product is compatible with these vehicles:

Year	Make	Model	Notes
2005	Chevrolet	Astro	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke Stamped #21024981
2005	Chevrolet	Blazer	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke Stamped #21024981
2005	Chevrolet	Express 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke 1st Design
2005	Chevrolet	Express 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke 1st Design
2005	GMC	Safari	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke Stamped #21024981
2005	GMC	Savana 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke 1st Design
2005	GMC	Savana 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke 1st Design
2004	Chevrolet	Astro	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	Chevrolet	Blazer	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	Chevrolet	Express 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	Chevrolet	Express 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	Chevrolet	S10	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	Chevrolet	Silverado 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	GMC	Safari	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	GMC	Savana 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	GMC	Savana 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	GMC	Sierra 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2004	GMC	Sonoma	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	Chevrolet	Astro	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	Chevrolet	Blazer	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	Chevrolet	Express 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke Engine VIN code X
2003	Chevrolet	Express 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	Chevrolet	S10	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	Chevrolet	Silverado 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke Engine VIN code X
2003	GMC	Safari	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	GMC	Savana 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	GMC	Savana 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	GMC	Sierra 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2003	GMC	Sonoma	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	Cadillac	DeVille	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2002	Cadillac	Eldorado	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2002	Cadillac	Seville	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2002	Chevrolet	Astro	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	Chevrolet	Blazer	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	Chevrolet	Express 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	Chevrolet	Express 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	Chevrolet	S10	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	Chevrolet	Silverado 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	GMC	Safari	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	GMC	Savana 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	GMC	Savana 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	GMC	Savana 3500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	GMC	Sierra 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	GMC	Sonoma	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2002	Saturn	SC1	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke
2002	Saturn	SL	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke
2002	Saturn	SL1	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke
2001	Cadillac	DeVille	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2001	Cadillac	Eldorado	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2001	Cadillac	Seville	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2001	Chevrolet	Astro	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	Chevrolet	Express 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	Chevrolet	Express 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	Chevrolet	Silverado 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	GMC	Safari	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	GMC	Savana 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	GMC	Savana 2500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	GMC	Savana 3500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	GMC	Sierra 1500	4.3L V engine 6 cylinders 4.00" bore 3.48" stroke
2001	Saturn	SC1	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke
2001	Saturn	SL	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke
2001	Saturn	SL1	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke
2000	Cadillac	DeVille	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2000	Cadillac	Eldorado	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2000	Cadillac	Seville	4.6L V engine 8 cylinders 3.66" bore 3.31" stroke
2000	Saturn	SC1	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke
2000	Saturn	SL	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke
2000	Saturn	SL1	1.9L Inline engine 4 cylinders 3.23" bore 3.54" stroke

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