Symptoms Of A Bad Knock Sensor

Knocking occurs when the air-fuel mixture self-ignites too quickly, causing damage to the cylinder head gasket and cylinder head. The knock sensor detects high-frequency engine vibrations characteristic of knocking and sends a signal to the ECU. However, it can be difficult to determine if the knock sensor itself is faulty since it won’t be able to detect a knocking engine. this is why you should know about the  Symptoms Of A Bad Knock Sensor

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.

Engine Making Noises

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

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.

Bad 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.

Conclusion

If any of these signs 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. If it is confirmed that the knock sensor is faulty, it should be replaced promptly to prevent further damage to the engine.