1. Symptoms
of a Bad
Knock
Sensor in
Your BMW

2. Engine detonation happens
during the internal combustion
process in your BMW

3. The fuel mixture in the cylinder
explodes and results in a change
in the ignition timing.

4. This detonation is known as
engine knocking.

5. There are knock sensors that detect
such vibrations and send a voltage
signal to the powertrain control
module.

6. But, as the knock sensor is an electronic
device, it can malfunction.

7. Some of the commonly observed
symptoms in a BMW when the knock
sensor turns bad are discussed here.

8. Engine warning
light

9. The check engine light glows up on
your dashboard when there is any
problem with the engine.

10. When the knock sensor fails to
operate then the warning light
illuminates and alerts the driver.

11. Get the engine checked by a
professional as it might be some
issue with the warning light.

12. Loud sounds

13. A malfunctioning knock sensor
give rise to instances of loud
noises coming from the engine.

14. The intensity of the sounds will just go
on rising if not resolved quickly.

15. The main reason for the loud noises is
due to the ignition of the air-fuel
mixture inside the cylinder.

16. Bad fuel mileage

17. A bad knock sensor could also result in
decreasing the fuel mileage of the BMW.

18. There is more use of the fuel than the
needed proportion in the air-fuel
mixture for the process of combustion.

19. Also, at time unused fuel drains out of the
car through the exhaust outlet pipe.

20. Poor engine
performance

21. Due to a bad knock sensor, the
engine starts to get damaged and
delivers very poor performance.

22. There can be a burning smell coming
from the engine into the cabin due to
serious issues in the engine.

23. In such a case, the BMW will
begin to continuously drag and
jerk around.

24. Poor acceleration

25. If you experience slow acceleration as
compared to normal conditions, then
the bad knock sensor is malfunctioning.

26. A faulty knock sensor prevents the
acceleration from being effective as it
obstructs the sufficient combustion of
the fuel mixture in the engine.

27. Get the knock sensors
checked by a technician.

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