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


YourMechanic Knock Sensor Replacement Service

Average Rating

4.7/5

Number of Reviews

65

Rating Summary
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1
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4
57
3
1
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4

Mila

8 years of experience
77 reviews
Mila
8 years of experience
Mila Bayat is the best mechanic I have ever experienced with my car. He is polite and honest and willing to go extra mile. I will recommend Mila Bayat to anyone %100 without any doubt. Mila will keep you engage of what is going on and very respectful. Best mechanic ever!!!!!!! I really liked the work Mila did on my car. This a true asset to your company, Your Mechanic.
2000 LEXUS ES300 - KNOCK SENSOR - WOODBRIDGE, VIRGINIA

Rodney

33 years of experience
336 reviews
Rodney
33 years of experience
He's a Great guy ! But you have to send another mechanic to repair what's not fixed ! Xterra's engine Light is still on and it Sounds like it's Stalling on idle !
2003 NISSAN XTERRA - KNOCK SENSOR - ELK GROVE, CALIFORNIA

Aaron

26 years of experience
47 reviews
Aaron
26 years of experience
Excellent service, very flexible and courteous!
1999 LEXUS ES300 - KNOCK SENSOR - TALLAHASSEE, FLORIDA

Dominic

25 years of experience
82 reviews
Dominic
25 years of experience
Very communicative and did the work great. Thanks!!
2004 CHEVROLET AVALANCHE 1500 - KNOCK SENSOR - LEHIGH ACRES, FLORIDA

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com