What does it mean when the sensor warning light comes on while driving?

1 Answers
LilaMarie
07/30/25 2:02am
When the sensor warning light comes on while driving, it is usually due to a faulty vehicle speed sensor or an issue with the speed signal processing module in the instrument cluster. The vehicle speed sensor functions by displaying the car's speed through needle movement and generally comes in three types: magnetic, Hall-effect, and optical. It is typically installed inside the drive axle housing or transmission case to eliminate electromagnetic and radio frequency interference caused by high-voltage ignition wires, car phones, or other electronic devices. Symptoms of a faulty vehicle speed sensor include: 1. Unstable engine performance at idle; 2. Momentary stalling or engine shutdown when starting the vehicle or slowing down to a stop.
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