About Knock Sensors:

In order to operate correctly, combustion engines explode a mixture of fuel at accurate intervals. The purpose of a knock sensor is to detect whether the engine is pre-igniting or detonating and prematurely sparking and igniting this mixture, as if this is the case it can lead to some engine damage. The sensor is essentially a microphone, designed and tuned to pick up the smallest of engine noises. The knock sensor continuously sends data to the engine cars computer. If the engine is pre-igniting, the cars computer will delay the spark plug timing to prevent it. The knock sensor is located on the input manifold or cylinder head.


Knock Sensor Location

How serious is a damaged knock sensor:

If your knock sensor is damaged it could lead to a some other damage. If you are worried about a damaged knock sensor it is a good idea to get it checked as it will prevent your car from additional damage. With a damaged knock sensor, you may experience a drop in power or a less smooth ride.



The fault code P0325 is an OBDII diagnostic fault code for a knock sensor. This fault code could be caused by the following

– A damaged knock sensor circuit

– A failed knock sensor

– Electrical wiring issues


Learn more on the fault code


Symptoms of a damages knock sensor:Check Engine

– Check Engine light This will be switched on if the knock sensor detects odd vibration / sound in the engine (due to pre-ignition and detonation).

– Knocking or pinging noises – If a knock sensor fails or is damaged, you may be able to hear a knocking or pinging sound coming from the engine.

– Driving doesn’t feel right – If you notice that your car doesn’t feel right while normally driving around it is possibly a damaged knock sensor. You may experience trouble at moderate to high speeds and when accelerating. This could mean your knock sensor is faulty and the engine is pre-igniting and not functioning as per usual.

– Loss of power – When the engine realizes there is a faulty knock sensor, it may lose a lot of power. This could be to protect itself from being damaged.

– Worse Fuel mileage – If the knock sensor is damaged and the engine is firing incorrectly, it will lead to less fuel efficiency and worse exhaust emissions.



Knock sensor replacements in Hamilton:

If you are worried about your knock sensor, our experienced, mechanics at Grimmer Motors can help. Our mechanics can easily diagnose and replace a damaged or failed knock sensor, and get you back on the road quickly.

At Grimmer Motors we offer a range of diagnostic and repairs. We specialize in diagnostic scans and repairs and can get it right first time.

For all diagnostic checks or knock sensor replacements in Hamilton, contact Grimmer Motors today!


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