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How to Check the Knock Sensor with Multimeter

The knock sensor is essential in determining whether your engine will be ruined by detonation. This can happen when two cylinders simultaneously go into overdrive, which causes their pistons to contact each other with such force as they race against one another’s velocities for both of them to achieve maximum efficiency during combustion while minimizing wasted energy release without any helpful work being done.”

How to Check the Knock Sensor with Multimeter

To ensure the knock sensor is working correctly, you can use a multimeter to test it. If there are any issues with your car and need routine maintenance or a tune-up, we have those covered too! In this post, I’ll show how to check the knock Sensor with Multimeter.

To test the knock sensor, follow the below steps.

To start, you’ll need to find your car’s knock sensor. It is located on the engine manifold and should have a wire harness connected with it that leads from its base towards where we can see electricity coming through as well- if not, keep reading for more help! Now take one end of this cord into either hand until there are two clean ends left; pull hard enough so they separate before releasing pressure (don’t worry about breaking anything).

What is Detonation? 

In a short phrase, the knock sensor is an essential component of your engine that prevents it from exploding. The device senses when there’s too much fuel and air mixture to prevent this problem before anything happens. Your multimeter will tell you if its wires have continuity or not by checking them against one another. At the same time, they’re connected across any current source – which can also be used as lightning protection for those who own homes with electric outlets nearby (a good idea regardless).

Do You Suspect a Bad Knock Sensor? 

You can have many different problems if your knock sensor is bad. It may not give accurate information about how fast you’re going or stop working altogether and cause no acceleration! Suppose there’s loud thumping noise coming from under the hood when this happens. In that case, it could also be because nothing will ignite until enough fuel has built up inside each cylinder since they don’t get fed immediately after startup anymore (and believe us – that explosion would feel amazing).

Diagnosing a Bad Knock Sensor 

Symptoms related to a bad knock sensor will lead you down an investigation path that DTCs can complicate. You may do one of three things: check the engine light on; poor performance during driving/accelerating (especially when cold); or visual inspections for burnt wires near the intake manifold area- all signs indicating possible problems with this crucial device.

How to Test a Knock Sensor with Multimeter 

Below is a step-by-step guide on how to check the knock sensor with a multimeter:

● Park your car on level ground, turn off the engine, and disengage emergency brakes. Open the hood to prevent possible injuries while turning it back on after opening up safely.
● To avoid unnecessary issues regarding locating the knock sensor, consult your repair manual. Your vehicle’s engine has many sensors that help optimize its performance and prevent problems from occurring, so you must use this guide to look for where they are located.
● Can you spot the wire harness? Disconnect it from the knock sensor by pulling on the harness base at the point it meets the sensor.
● To test for a good connection between your multimeter and knock sensors, you must clip its lead on the negative terminal. If there is continuity in this area, then it means that both parts of hardware work properly together as one unit, which can be helpful if replacing either component individually would result in an incorrectly installed sensor leading to trouble down the line.

What if There is No Continuity? 

The knock sensor on your car is essential for accurate readings and will let you know when there’s an issue. If the multimeter shows no continuity, then this means that it needs replacing too.


Knock sensors are essential for detecting when you knock on the engine. When one is not working, it could lead to a pinging sound which will be heard through your speakers or headphones and may even cause an underpowered motor! The worst part? Your computer might never detect this issue so consider replacing him before things get worse…

Syed Muhammad Jawad

System Analyst / Founder / CEO

Explore comprehensive, expert reviews of electronic multimeters by Syed Muhammad Jawad, the respected author and electronics enthusiast. Delve into his insightful analysis, detailed comparisons, and trusted recommendations to make informed decisions on your next multimeter purchase.