How to replace the Knock Sensor (KS) on Chevrolet Blazer?

Start the ks replacement process by disconnecting the negative Battery Cable while adhering to battery disconnect caution. First disconnect the Knock Sensor harness connector. After that remove the Distributor along with fuel pipes until you can disconnect the Knock Sensor harness. First remove the Knock Sensor retaining bolt then extract the Knock Sensor. Installation involves positioning the new Knock Sensor in position followed by bolt tightening to 25 n.m (18 lb ft). First reconnect the Knock Sensor harness connector and then reinstall the fuel pipes before adding the Distributor and finally connect the negative Battery Cable.

OEM Chevrolet Blazer Knock Sensor

Engine Knock Sensor

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12 Knock Sensors found

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Chevrolet Blazer Knock Sensor Part Number: 21024981
$32.61 MSRP: $61.25
You Save: $28.64 (47%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor)
- Replaced by: 19434673
- Replaces: 21024729
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2005 Chevrolet Blazer | Base, LS, LT, Trailblazer, Xtreme, ZR2 | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 12623095
$23.43 MSRP: $44.02
You Save: $20.59 (47%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor)
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2021 Chevrolet Blazer | Base, L, LT | 4 Cyl 2.5 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 10456549
$38.42 MSRP: $119.81
You Save: $81.39 (68%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor); ESC Sensor
- Replaces: 10456031
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1992-1994 Chevrolet Blazer | Base, Cheyenne, Silverado, Silverado Sport | 8 Cyl 5.7 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 10456288
$47.98 MSRP: $97.45
You Save: $49.47 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor); ESC Sensor; Sensor, Engine Crankcase Ventilator
- Replaces: 10456018
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1990-1994 Chevrolet Blazer | Base, Cheyenne, Scottsdale, Silverado, Silverado Sport | 8 Cyl 5.7 L GAS, 8 Cyl 6.5 L DIESEL
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Chevrolet Blazer Knock Sensor Part Number: 10456018
$47.98 MSRP: $97.45
You Save: $49.47 (51%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor)
- Replaced by: 10456288
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1990-1991 Chevrolet Blazer | Scottsdale, Silverado | 8 Cyl 5.7 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 55503494
$14.80 MSRP: $26.40
You Save: $11.60 (44%)
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Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor)
- Replaced by: 12737536
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2020-2024 Chevrolet Blazer | LT, Premier, RS | 4 Cyl 2.0 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 12663209
$4.12 MSRP: $7.73
You Save: $3.61 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor)
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2020-2023 Chevrolet Blazer | LT, Premier | 4 Cyl 2.0 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 12729597
$19.80 MSRP: $37.18
You Save: $17.38 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor); Camshaft Sensor
- Replaces: 12692505, 12605738, 12636736
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2024 Chevrolet Blazer | Base, LT, Premier, RS | 6 Cyl 3.6 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 10456146
Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor); ESC Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995 Chevrolet Blazer | Base, LT | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 10456019
Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor)
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1994 Chevrolet Blazer | Base, Silverado, Silverado Sport | 8 Cyl 5.7 L GAS, 8 Cyl 6.5 L DIESEL
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Chevrolet Blazer Knock Sensor Part Number: 10456218
Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor)
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995 Chevrolet Blazer | Base, LT | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Knock Sensor Part Number: 10456075
Product Specifications
- Other Name: Sensor, Distributor (Also Knock Sensor)
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2000 Chevrolet Blazer | Base, LS, LT, Trailblazer | 6 Cyl 4.3 L GAS

Chevrolet Blazer Knock Sensor

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The Knock Sensor in Chevrolet Blazer is one of the most important parts which is involved in sensing the knock of the engine and sending signals to the powertrain control module for the adjustment of ignition timing. Usually piezoelectric, the Knock Sensor uses the mechanical oscillations to produce electric signals for pressure burst, characteristic of knock. This enables an accurate setting of the engines ignition time, thus the premier setting for performance without harming the engine. It is possible to fine-tune those timings for each cylinder and control the boost pressure or even each cylinder's ignition and fuel injection to always perform optimally and last longer in various conditions. Knock Sensors of Chevrolet Blazer ensure the proper opration of the engine, safeguarding it against possible problems linked to detonation.

Chevrolet Blazer Knock Sensor Parts Questions & Experts Answers

Knock Sensor
21024981
Q: How to replace the Knock Sensor (KS) on Chevrolet Blazer?
A:
Start the ks replacement process by disconnecting the negative Battery Cable while adhering to battery disconnect caution. First disconnect the Knock Sensor harness connector. After that remove the Distributor along with fuel pipes until you can disconnect the Knock Sensor harness. First remove the Knock Sensor retaining bolt then extract the Knock Sensor. Installation involves positioning the new Knock Sensor in position followed by bolt tightening to 25 n.m (18 lb ft). First reconnect the Knock Sensor harness connector and then reinstall the fuel pipes before adding the Distributor and finally connect the negative Battery Cable.