Will the Check Engine light Reset Itself After Repair?

The check engine light will typically turn off automatically once the problem that brought it on has been resolved, but only after 10 to 20 “cycles”. In this context, the process of turning on the car, letting it run for a while, and then shutting it off once more is referred to as a cycle.

Will the Check Engine light Reset Itself After Repair?

It is simpler and quicker to manually reset your check engine light with an OBD2 scanner if you want to be certain that the problem has been resolved. After a little period, if the light comes back on, the initial problem has not yet been fixed. So, let’s take a closer at the question, which says “Will the check engine light reset itself after repair.” With that being said, the answers to the related questions will be discussed:

  • What causes the check engine light to come on?
  • But what if the check engine light won’t turn off by itself?
  • Will disconnecting the battery reset the check engine light?


What causes the check engine light to come on?

The following are the most common reasons why your car check engine light is on:

Fuel Cap That Is Loose

This one is actually quite prevalent. Sometimes you don’t tighten the gas cap all the way (listen for the click), or perhaps you never replaced it in the first place. In any case, it’s a simple issue to identify and resolve.

Spark Plugs or Ignition Coils Malfunction

When one of your spark plugs or ignition coils is malfunctioning, the check engine light will also often turn on. It’s possible that something isn’t firing properly, which could result in decreased engine performance, and the check engine light is alerting you to the issue.

Transmission Damage

Transmission damage can also cause the check engine light to turn on and alert you to an issue, even if your transmission may have its own unique warning lights. You might simply need a transmission service to replenish the fluid, or you might need to repair more serious internal problems.

Additional Emissions Issues

The most frequent cause of check engine light illumination is the emissions/exhaust system. There can be a catalytic converter issue or an exhaust leak. Another sensor that is susceptible to failure is the mass airflow sensor (MAF). If your check engine light is on, it is typically a good idea to get your exhaust system serviced.

Wiring Problems

A lot of wiring, from the battery to the spark plug wires and the ignition system in between, is necessary for your car to start and keep running smoothly. The check engine light may come on as a result of a loose connection or damaged wire.

Faulty Cooling System

Once more, an overheating vehicle will have its own temperature gauges and warning lights. The check engine light, however, could also come on if the cooling system isn’t working properly.

Problem with the Fuel System

The check engine light may turn on to alert you that something is wrong with the fuel system if your engine isn’t getting enough gasoline or if the fuel is contaminated because the filter needs to be replaced.

Low or polluted Motor Oil

Oil levels may be low or the oil itself may be stale and polluted. This will result in performance loss and engine issues that can set up the check engine light. It’s possible that you simply need to get your oil changed or that there is a leak in the fluid system.

Problem with Oxygen Sensor

Your emissions system has oxygen sensors to look for problems with the exhaust. The check engine light would most likely come on if there are pollution issues. The sensor itself may occasionally malfunction or produce inaccurate results, necessitating replacement.

Will the check engine light reset itself?

Unless you resolve the issue, the check engine light is generally not going to reset itself. It might reset itself if you fix the issue, although it might take some time. Before the check engine light is reset, a car typically requires 10–20 successful cycles. When you start your automobile cold, drive it till it warms up, turn off the engine, and stop driving, you have completed a cycle.

After 10–20 successful cycles—which, as you might understand, can take a long time—the check engine light will reset itself if you are certain that you have resolved the issue that was the cause of the check engine light. In this situation, using an OBD2 scanner to reset the check engine light is far more practical.

But what if the check engine light won’t turn off by itself?

You must be aware that some automobile models won’t automatically reset the check light; you must use a scanner to do so if you have been driving for a long time with numerous successful cycles after you addressed the problem without any issues, but the engine control module still doesn’t reset the check light.

Although a scanner may seem like a costly tool, you can really find one that works well for not much money these days. This will prevent you from having to pay a mechanic every time you need to view or reset the engine codes. You may also ask a mechanic to reset the codes for free; many will gladly do so as it will only take them five minutes and they might get a new customer.

Will disconnecting the battery reset the check engine light?

The check engine light may occasionally be temporarily reset by disconnecting the battery, but this is not a guaranteed or reliable solution, and it might not address the underlying problem that caused the light in the first place. The check engine light is a feature of the onboard diagnostics system (OBD-II) in contemporary cars.

The presence of the light signifies that the computer of the car has identified a defect or issue with one of the monitored systems. A diagnostic trouble code (DTC) corresponding to the problem is stored by the OBD-II system. However, many more recent vehicles include backup power sources that keep some data even when the battery is briefly disconnected.

Disconnecting the battery for a brief period of time may be sufficient to clear the problem codes and reset the check engine light. Additionally, when the car’s computer re-evaluates the system after clearing the codes but leaving the underlying issue unattended, the check engine light may come back on.

It’s crucial to identify and fix the precise issue causing your check engine light if it’s on. Using an OBD-II scanner or taking your car to a repair who can interpret the trouble codes and correctly identify the issue is the best line of action. The check engine light should automatically switch off once the issue has been repaired, at which point the mechanic can clear the trouble codes.

Keep in mind that an illuminated check engine light could signify a number of issues, some of which could be vital to the efficiency and emissions of your car. Ignoring it could result in future costly repairs and more serious problems.

Related Article

Watch the video below to learn more


Can a check engine light go away on its own?

Yes, in some cases, the check engine light can go away on its own if the underlying issue resolves without further problems.

Do I need to clear check engine codes after repair?

Not always, but it’s recommended to clear the codes using a diagnostic tool to ensure the check engine light is reset after a successful repair.

How do I turn off the check engine light after repair?

Use a diagnostic tool or visit a mechanic to clear the trouble codes, which will turn off the check engine light.

How far do you have to drive to reset the check engine light?

The distance doesn’t matter. The check engine light resets after the vehicle completes a specified number of successful driving cycles.

Why does the engine light stay on after repair?

The check engine light might stay on after a repair if the underlying issue persists or if the codes are not cleared.

What are all the reasons a check engine light comes on?

Numerous reasons can trigger the check engine light, including issues with the engine, emissions, sensors, or other vehicle systems.

What happens if your check engine light stays on?

If the check engine light stays on, it indicates an ongoing problem that requires attention. Continued driving without addressing the issue could lead to more severe damage or decreased fuel efficiency.


After fixing the problem that caused the check engine light to come on, it can reset by itself. To speed up the procedure and guarantee the light remains off, use an OBD-II scanner to erase any unresolved fault codes. That is all for this article, where the answer to the following question has been discussed:

  • What causes the check engine light to come on?
  • But what if the check engine light won’t turn off by itself?
  • Will disconnecting the battery reset the check engine light?

Hope it was helpful. If so, kindly share it with others. Thanks for reading; see you around!