Knock Sensor Replacement at your home or office

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Knock Sensor Replacement Service

What is the Knock Sensor all about?

The engine produces vibrations while running, and those vibrations change depending on how well the engine is running. When the engine is running poorly, often it can be corrected by adjusting the timing slightly. This is known as spark advance and retard. The knock sensor detects the vibrations in the engine and reports them back to the engine control module. From the frequency of the vibrations, the engine control module can advance or retard the timing to make the engine run smoother. The knock sensor is threaded into a hole in the engine block, cylinder head, or under the intake manifold. When the knock sensor isn’t operating properly, the engine will knock under load or when accelerating, and the Check Engine light will illuminate.

Keep in mind:

  • The knock sensor is an electrical sensor. If it fails, it will need to be replaced.
  • The symptoms of a faulty knock sensor are often misdiagnosed. A scan test can help isolate the failure without replacing unnecessary parts.

How it's done:

  • The vehicle is raised and supported on jack stands or the intake manifold is removed per manual as needed for access to the knock sensor.

  • The Knock Sensor is disconnected and unscrewed from the engine block.

  • The new knock sensor is installed, torqued to the correct specifications, and connected.

  • The vehicle is lowered off the jack stands or the intake manifold is reinstalled per manual.

  • The knock sensor is tested and the vehicle is road tested to ensure proper operation.

Our recommendation:

The knock sensor is commonly misdiagnosed as the symptoms related to it are similar to many other running problems. Have a mechanic check the codes in the engine control module to determine if the knock sensor is reading correctly. If there is a knock sensor-related code or the output from the knock sensor isn’t correct, the knock sensor needs to be replaced.

What common symptoms indicate you may need to replace the Knock Sensor?

  • Engine knocks loudly especially at highway speeds or on acceleration
  • Unexplained poor fuel mileage
  • Decreased performance under load or on acceleration
  • Check Engine light is on

How important is this service?

The knock sensor can cause the engine to run lean and hot if it is faulty, or it can run rich and burn excessive amounts of fuel. Driving your vehicle with a faulty knock sensor can lead to further repairs required from the symptoms if not addressed promptly.

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Recent Knock Sensor Replacement reviews

Excellent Rating

(117)

Rating Summary
105
5
2
0
5
105
5
2
0
5

Andrew

15 years of experience
456 reviews
Andrew
15 years of experience
Subaru Outback H4-2.5L - Knock Sensor - Tualatin, Oregon
He was early and professional. This is greatly appreciated since I requested the repair done at my place of work. Thanks!!
Honda CR-V - Knock Sensor - Portland, Oregon
Andrew was professional and timely. He was able to perform the repair within the time frame allotted. He was friendly and made sure my vehicle was safe to drive.

Mark

41 years of experience
77 reviews
Mark
41 years of experience
Honda Ridgeline V6-3.5L - Knock Sensor - Canton, Georgia
Very happy with the service. I'll be using your service in the future and requesting that Mark be " My Mechanic "!
Nissan Quest - Knock Sensor - Alpharetta, Georgia
Mark was here exactly on time he repaired my vehicle i don't even think he had lunch. He was very organized and neat. I could tell he knew exactly what he was doing. Very professional and courteous. This was my first time using YOUR MECHANIC but it won't be the last. Thank you

Peter

43 years of experience
1321 reviews
Peter
43 years of experience
Chevrolet Silverado 1500 V8-4.8L - Knock Sensor - Buckeye, Arizona
Peter showed up early again which is great. He came to replace my aftermarket knock sensors with OEM. He informed me that I need a hose replaced as he was removing parts to get to sensors THANK YOU. I definitely will request Peter and recommend him to others. All around very nice guy. We had some laughs. Peter made sure I took truck for a run before he left to make sure everything ran top notch. Thanks again Peter
Chevrolet Silverado 1500 - Knock Sensor - Buckeye, Arizona
Peter was very nice. Straight to the point. Gave recommendations and improvements. He called and informed me that I needed a part for my vehicle he noticed it right away it was bad

Efrain

20 years of experience
41 reviews
Efrain
20 years of experience
GMC Yukon V8-5.3L - Knock Sensor - Bowie, Maryland
Scrim was very professional and answered all my questions Will request for him for all future repairs

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