Keep in mind that your knock sensor needs to hear and feel what’s going on.īecause of the wide variance in a knock sensor’s locations, it’s best to have an idea of what you’re looking for before you start. The most common is that it is bolted to the engine block. There are a few different possible locations for the knock sensor, but the most common places include the engine block, the cylinder head, or the intake manifold. Keep in mind that not all knocks are loud, so if you don’t know what you’re looking for, it’s best to have a certified mechanic take a look at it and make a diagnosis. Otherwise, you might be replacing a sensor that’s doing exactly what it’s supposed to! That’s why you need to rule out a potential engine knock before determining that you have a faulty knock sensor. You’ll notice the exact same symptoms if you have a faulty knock sensor that you would detect if you actually had a knock in your engine! While this is a useful feature to protect your engine when something goes wrong, it can also make it a bit frustrating to troubleshoot a faulty knock sensor. If the knock sensor does detect a problem, it illuminates the check engine light and reduces overall engine performance to protect your vehicle. These strange noises are known as knocks and indicate a deeper problem in your system that you need to troubleshoot. The purpose of the knock sensor is to check for abnormal noises coming from the combustion chamber. This fuel economy reduction isn’t likely to be super noticeable, but you’ll probably see a drop by a few miles per gallon. Not only does that affect power and acceleration, but it also affects fuel economy. Loss of Fuel EconomyĪnytime that your engine reverts to default values, you’re not getting an optimized performance. That’s because those default values that your engine reverts to reduce your engine’s performance to keep your engine from producing too much and force and causing further damage.īut by reducing the amount of force, your engine’s computer also reduces the amount of power that the engine can produce. If your vehicle has a faulty knock sensor, it won’t only affect how quickly it can accelerate, but it’ll also lose its top speed and torque. Not only does it decrease the likelihood of further damage, but it also reduces overall emissions to stay compliant with EPA standards. This occurs as your engine defaults to reduced outputs to prevent any potential engine damage. Decreased AccelerationĪs soon as your knock sensor gives you, you’re going to notice a decrease in acceleration. Learn more here: 6 Causes of a Knocking or Pinging Car Engine 3. This is definitely something you want to avoid. Knocking engineĮven if your engine control module will, in most cases, do just fine without the knock sensor, it can lead to engine knocking or pinging in rare cases.Įngine knocking or pinging is fatal to your engine, and it can cause serious damage to it within seconds. Just because you have a check engine light for your knock sensor doesn’t mean that there’s anything wrong with the sensor, but there could be! Another possibility is that your vehicle has an engine knock.Įither way, you’ll get a check engine light, so you’ll have to narrow down the problem a bit further after you read the engine code. It can also result in a knocking or detonating engine in the worst case, but most often you will notice signs like loss of engine power and high fuel consumption.īelow we have a more detailed list of the signs of a bad or failing knock sensor to look for: 1. The most common symptom of a bad knock sensor is a check engine light on your dashboard. Knock Sensor Replacement Cost Symptoms Of A Bad Knock Sensor
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