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Knock Sensor

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Bang. Clunk. Shake. Uh, oh'sounds like your knock sensor is shot. Without a properly working knock sensor your car's engine cannot process fuel without knocking, pinging, and rattling its way down the street. Turn off your car when the knock sensor is dead and you are likely to witness your car shaking, gasping, and rattling for several seconds after you turn off the ignition. You need a new knock sensor, my friend. Don't risk damage to your engine by letting the problem continue. Nip it in the bud with one of our knock sensors and save money too. We buy all of our knock sensors directly from the manufacturer, so you save money. We only carry OEM or better parts and we sell all that we stock at a discount. You save money and get the best knock sensors you can find. You want to be the talk of the town with your fine looking roadster, but you don't want the town talking about the noise coming from underneath your hood. Check our online catalog, find the knock sensor that is right for the make and model of your car, and order it today. Our service and prices are unbeatable.

Buying Guides
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A Guide to Shopping for a New Knock Sensor

Have you ever tried continuously hitting your engine with a hammer? Chances are you haven't-unless you want to destroy the engine. Do you know that engine knocks have that same effect? If you ignore these knocks, your car will end up with damaged pistons, valves, and other engine parts. And, that's exactly what will happen if you don't have an efficient knock sensor in your vehicle.

If you're out in the market searching for a new knock sensor, this guide will help you find the correct one for your ride.

A Quick Look at the Two Types of Knock Sensor

All knock sensors operate the same way: by detecting engine knock/noise and sending signals to the car's electronic control unit (ECU) so that it can do the needed adjustment and eliminate the knock. There are generally two types of sensor design available today, as follow:

  • Broadband single wire sensor. This is an older design that works through the ECU familiarizing itself with the normal range of engine noise. Whenever the ECU receives a signal indicating a value higher than the normal range, it registers a knock and performs the necessary adjustment. This sensor can accommodate a wide range of changes in the engine's noise frequency, and it is also less susceptible to electromagnetic interference while it works.
  • Flat response two-wire sensor. This is a newer design that works with a predetermined range of engine frequency. Whenever engine knock is detected, the sensor sends out a voltage that is higher than the said range. The advantage with this type of sensor is that it is more accurate compared to the first type.

Both of these sensors work using a piezoelectric element that receives the vibrations from the engine, upon which it generates voltage and sends this voltage to the ECU. They differ, however, in such a way that one sensor may not be compatible with an ECU that is originally designed to work with the other type of sensor. That said, you need to be sure that you get just the correct sensor type.

Other Knock Sensor Choices Available

When selecting the correct sensor, you'll find that there are different choices available for you. You can get a single sensor, one that's already a complete assembly, or one that comes in a kit. Some sensors already come with a harness while others don't-choose the best one that will meet your needs.

Repair Guides
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Replacing a Damaged Knock Sensor

A damaged knock sensor is like a bomb waiting to explode. If you neglect the problem, it's only a matter of time before your car engine falls into destruction. That said, it's important to replace the knock sensor as soon as you find it damaged. Lucky you, replacing this sensor is easy. The real challenging part is gaining access to the sensor, the location of which will depend on your vehicle. This part is generally located in such a way that it will be most sensitive to engine knock.

So, are you ready to replace the sensor? Here we go:

Difficulty Level: Easy

What You'll Need:

  1. New knock sensor
  2. Ratchet wrench
  3. Socket set

Instructions:

NOTE: Always disconnect the battery's negative terminal before beginning this process, then reconnect it after installing the new sensor. Depending on your vehicle, you may need to remove the intake manifold or the EGR solenoid to gain access to the knock sensor. Once you gain access to the sensor, everything is straightforward.

Step 1: Remove the sensor from the engine. It is usually bolted to the engine block, removal of which will entail the use of a wrench and socket.

Step 2: You'll see a plug connected to the sensor. Gently unplug it before lifting the sensor out.

Step 3: Do a comparison between the old and new sensor, just to be sure they are the same, before you mount the new one.

Step 4: Connect the plug to the new sensor, then bolt it back into the engine block. Start by hand, then tighten it the rest of the way using your wrench and socket. Be careful not to over-tighten the sensor.

Once you have the new sensor mounted and all the other parts placed back in their location, start the car and drive it for a while to check.