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Why my engine light turn off on 98 Mazda Millenia and the car runs fine?

There are several possible reasons why the engine light on your 1998 Mazda Millenia may have turned off and the car is running fine. Here are a few things to consider:

1. Temporary Glitch: Sometimes, the engine light may illuminate due to a temporary glitch or electrical issue. If the problem is minor and resolves itself, the engine light may turn off on its own.

2. Faulty Sensor: A faulty or malfunctioning sensor, such as an oxygen sensor or mass airflow sensor, can trigger the engine light. If the sensor issue resolves itself or the sensor is temporarily disconnected, the engine light may turn off.

3. Loose Gas Cap: A loose or improperly tightened gas cap can cause the engine light to come on. If you recently tightened the gas cap or ensured it was properly closed, this could explain why the engine light turned off.

4. ECU Reset: Disconnecting the car battery or performing an ECU (Electronic Control Unit) reset can clear any stored error codes and turn off the engine light. If you recently disconnected the battery or reset the ECU, this could have cleared the issue.

5. Repair: If you have recently had the car serviced or repaired, it's possible that the underlying problem causing the engine light to illuminate was fixed, leading to the light turning off.

However, it's important to note that while the engine light may have turned off, it doesn't necessarily mean the problem has been fully resolved. Stored error codes and underlying issues may still exist that could resurface in the future. It's advisable to have the car diagnosed by a qualified mechanic using a scan tool to identify and address any potential issues.