Why is the alarm still on after replacing the tire pressure sensor?
2 Answers
Power on the car but do not start the engine. Then simultaneously press the lock and unlock buttons on the remote control for 5 seconds, and release when you hear the car beep twice. Unscrew the valve cap on the tire and continuously deflate the tire, which may take 10 to 20 seconds. Keep deflating if you don't hear a beep. Once the car emits a short beep, the front left wheel is set. Then inflate the tire, and the tire pressure monitoring reset is complete.
After replacing the tire pressure sensor, the warning light is still on. As someone who often repairs my own car, I think the initialization steps might not have been completed. After replacing the sensor, it needs to be re-matched with the vehicle system. The method varies by car model—most require driving for a while or pressing a specific button in the car. Also, check if the sensor is properly installed; sometimes misalignment or poor contact can prevent the system from recognizing it. For older cars, using the wrong sensor model can also trigger the warning. Don’t ignore the alert—low tire pressure increases the risk of a blowout. I recommend checking the manual first for reset steps. If unsure, visit a repair shop as soon as possible for a professional scan. Driving with the warning light on is unsafe, damages tires, and hurts fuel efficiency. Regular tire maintenance can help avoid such issues.
