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Why does your ABS light come on when you start car?

The ABS (Anti-lock Braking System) light in your car may illuminate momentarily when you start the vehicle as part of the system's self-diagnostic process. This is normal, and the ABS light should turn off after a few seconds if the system is functioning properly.

However, if the ABS light remains on or illuminates while you're driving, it's important to have your vehicle inspected by a qualified mechanic or automotive technician. Here are a few reasons why the ABS light might remain on:

1. Sensor Issues: The ABS system uses sensors to detect the speed of each wheel. If one or more of these sensors become faulty or damaged, the ABS light may turn on.

2. Hydraulic System Issues: The ABS system relies on hydraulic pressure to modulate braking force. If there's a problem with the ABS hydraulic unit, such as low brake fluid or a malfunctioning pressure modulator, the ABS light might illuminate.

3. Electrical Issues: The ABS system is controlled by an electronic control module (ECM). Faulty electrical connections, damaged wiring, or a problem with the ABS control module itself could lead to the ABS light coming on.

4. Mechanical Issues: In some cases, the ABS light may also come on if there's a mechanical problem with the brakes. This could include a stuck brake caliper, faulty wheel bearings, or excessive play in the suspension components.

If the ABS light stays on, it's important to have the underlying issue diagnosed and repaired as soon as possible. While you can still drive the car with the ABS light on, the ABS system might not be functioning properly, which can compromise the safety and stability of your vehicle during braking.