Symptoms of a bad Knock Sensor

6 Common Symptoms Of A Bad Knock Sensor


If any of the symptoms of a bad knock sensor mentioned below are noticed, a scan tool or code reader should be used to check for trouble codes related to the knock sensor.

Additionally, a timing light, mechanic’s stethoscope, multimeter, compression tester, and borescope can be used for further diagnosis.

The common signs of a bad knock sensor include a check engine light, engine noise, power loss, and a decline in engine performance.

If it is confirmed that the knock sensor is faulty, it should be replaced promptly to prevent further damage to the engine. But before that, it’s very important to know the symptoms of a bad knock sensor.

Now, let’s go deep into explaining the symptoms of a bad knock sensor!


1. Check engine light.

The engine light will come on, and an associated diagnostic problem code (DTC) will be set off when the Powertrain Control Module (PCM) discovers a bad knock sensor or voltage circuit.

2. Engine-making noise

The PCM might not be able to detect or adjust the spark knock frequency if the knock sensor fails. The engine may make a metallic pinging noise if the sensor fails.

Additionally, you’ll observe that the noise is most noticeable while the engine is working under a heavy load.

Read More: Engine Blow-by: What is it and How to Fix it

3. Power Loss

Your car may experience power loss when the engine control unit detects a malfunctioning knock sensor. The amount of power lost depends on the engine’s maximum octane rating and its reliance on knock sensor input.

High-compression and flex-fuel engines are most affected by power loss. This loss affects engine timing and prevents the transmission from engaging until the knock sensor is repaired.

Decline in Engine Performance

Engine performance may suffer as a result of the PCM incorrectly changing the ignition timing brought on by a damaged engine knock sensor. When traveling at high speed or when the car is pulling a heavy load, the engine might not feel right. Even if the check engine light is not on, you should have it checked by a certified mechanic.

Symptoms of a bad Knock Sensor

That’s all for this article, where we discussed the symptoms of a bad knock sensor. I hope it was helpful. If so, kindly share. Thanks for reading. See you around!


3 responses to “6 Common Symptoms Of A Bad Knock Sensor”

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  2. Pedro Perez Avatar
    Pedro Perez

    This was a really informative article that shed light on the symptoms of a bad knock snesor. I’ll definitely be keeping a closer eye out for any of these symptoms going forward.

  3. Loved how straight forward your article is. So, that means a faulty knock sensor could cause engine knocking, misfiring, and even reduced fuel efficiency. I guess my next stop will be at my mechanic, cuz it seems like i have a bad knock sensor. Thanks though.

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