What are the symptoms of a faulty knock sensor?
2 Answers
The symptoms of a faulty knock sensor are: 1. It will reduce the engine power; 2. The engine will produce a knocking sound; 3. It may damage the engine pistons and cylinder block; 4. It cannot detect engine knock signals; 5. It cannot automatically retard the ignition timing; 6. The engine warning light on the dashboard will illuminate. The knock sensor is a sensor that detects engine knock. A sensor is a detection device that can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to certain rules, to meet the requirements of information transmission, processing, storage, display, recording, and control.
If the knock sensor is faulty, I can tell you from experience that common symptoms include the sudden illumination of the engine warning light, a noticeable drop in the car's power, difficulty accelerating when pressing the gas pedal, and a feeling that the entire vehicle is being held back. You'll notice the engine shaking violently, especially during acceleration, as if it's struggling and wobbling, sometimes accompanied by a metallic rattling sound, which is a sign of internal engine knocking. Fuel consumption will skyrocket—my regular customers have mentioned that a full tank of gas runs out in just a few days because the system can't properly adjust the combustion state. Other issues include difficulty starting the engine when cold or unstable idling, where the car may even tremble when stopped at a red light. If not addressed promptly, knocking can damage the pistons or cylinder walls, leading to costly repairs. I recommend checking the trouble codes with an OBD scanner as soon as these signs appear. In most cases, replacing the sensor will solve the problem, but delaying repairs increases the risk of major engine damage.
