How to reset “Check engine” light

Are you worried about your car’s check engine light? You don’t need to stress anymore – there are simple ways to reset the light and get back on the road. In this blog, we’ll discuss how to reset the “check engine” light easily so you can continue driving worry-free.


The “Check Engine” light can be a frustrating and confusing sight for car owners. It can indicate a range of underlying issues that need to be addressed promptly. However, if you’re certain there’s no real issue with your car, or you’ve fixed the problem and the light persists, you can reset the “Check Engine” light. Resetting this light is a simple process that every car owner should know how to do.

Not only does it save you a trip to the mechanic, but it also helps you avoid unnecessary repair costs. Here’s how to reset the “Check Engine” light with ease:

What is a Check Engine Light?

The Check Engine Light, also known as the Malfunction Indicator Lamp, is a warning system in your car’s onboard computer that alerts you to an issue in your vehicle’s engine, transmission or other systems.

Here’s how to reset the Check Engine Light:

  1. Use an OBD-II Scanner – plug in the scanner, turn on the ignition, and follow the scanner’s prompts to erase the codes and reset the light. You can purchase or rent an OBD-II scanner from an auto parts store or online.
  2. Disconnect the battery – use a wrench to disconnect the negative terminal of the battery, wait for 15 minutes, then reconnect the terminal. This will reset the onboard computer and the Check Engine Light.

However, keep in mind that resetting the Check Engine Light without addressing the underlying issue can lead to more severe problems down the line.

Pro Tip: If you’re unsure of the cause of the Check Engine Light, take your car to a mechanic or auto parts store for a free diagnostic check.

Reasons for a Check Engine Light to Illuminate

The Check Engine Light illuminates in response to a variety of problems occurring within your vehicle’s systems. Some reasons for a Check Engine Light may include a failing oxygen sensor, a faulty catalytic converter, or a loose gas cap.

When the Check Engine Light illuminates, it is important to have your vehicle inspected and diagnosed by a mechanic promptly. Ignoring the Check Engine Light may lead to more severe problems developing over time, such as engine damage or reduced fuel efficiency.

While it is possible to reset the Check Engine Light manually by disconnecting the battery, this is not recommended. The best way to reset the Check Engine Light is to have the underlying issue resolved by a mechanic. Once the issue has been addressed, the Check Engine Light may be reset by the mechanic using a diagnostic tool.

How to Diagnose a Check Engine Light

The check engine light is an indicator that suggests that something is wrong with your car’s internal system. Here is how to diagnose it:

  1. Use an OBD scanner or code reader to scan for error codes. Most auto parts stores offer this service for free.
  2. Look up the error code online or in your car’s manual to determine what is causing the check engine light to appear.
  3. Address the problem. Depending on the issue, this may involve replacing a part or tightening a loose gas cap.

As for resetting the “check engine” light:

  1. Fix the underlying problem that caused the “check engine” light to come on.
  2. Disconnect the negative battery cable for 15 minutes to reset the computer’s memory.
  3. Reconnect the battery cable, start the engine, and wait to see if the check engine light reappears.

How to Reset a Check Engine Light

Resetting a check engine light can save you the hassle of taking your car to a mechanic and lead to more efficient car maintenance. Here are the steps to follow:

  1. Find your car’s OBD-II (On-Board Diagnostic) port. This port allows you to connect with a scanner tool to read and clear the codes that trigger the check engine light.
  2. Use an OBD-II scanner tool to read the codes, diagnose the problem, and reset the check engine lights. Some scanner tools can also connect to your phone via Bluetooth and display the codes on an app.
  3. If you don’t have an OBD-II scanner tool, you can disconnect your car’s battery for a few minutes to reset the check engine light. This method may not work for all car models and may also reset other important settings.

Pro tip: Be sure to find the root cause of the check engine light before resetting it. Ignoring the underlying problem can lead to more severe car damage and costly repairs.

What to Do After Resetting a Check Engine Light

Resetting a check engine light is easy, but it’s essential to address the underlying issue that caused the light to turn on in the first place. Here’s how to do it:

  1. Step 1: Check your vehicle’s user manual to locate the reset button. If your vehicle doesn’t have one, you can disconnect the battery’s negative terminal using a wrench.
  2. Step 2: After you’ve located the reset button or disconnected the battery, turn on the car’s ignition without starting the engine.
  3. Step 3: Find the reset button again and hold it down for 10-15 seconds or until the check engine light blinks off.
  4. Step 4: Release the reset button, turn off the ignition, and wait for 10 seconds.
  5. Step 5: Turn on the car’s ignition again and check if the check engine light is still off.

If the light comes back on or continues to flash, take your vehicle to a trusted mechanic or an authorized service center to check for any underlying issues. Never ignore a check engine light – it is a warning sign that something is wrong with your vehicle.

Common Problems with Check Engine Lights

The check engine light can be triggered by various car problems, ranging from minor to severe. Some of the most common issues that cause the check engine light to come on include:

  • A loose gas cap
  • A faulty oxygen sensor
  • A damaged catalytic converter
  • A malfunctioning mass airflow sensor

To reset the “check engine” light, you can try the following methods:

  1. Scan and clear the error code using an OBD-II scanner.
  2. Turn off the engine and disconnect the battery cables for a few minutes. Remember to use caution when disconnecting the battery cables and consult your car manual if you’re not sure how to do it.
  3. Hold down the “trip” button while starting the engine to reset the light.
  4. In some cases, the check engine light may reset on its own after a few driving cycles.

Remember that resetting the check engine light won’t fix the underlying problem. If the light comes back on, it’s crucial to diagnose and repair the issue before it leads to more severe or costly problems.

Pro tip: Consider investing in an OBD-II scanner to help you diagnose the cause of the check engine light and save yourself time and money in future repairs.


In conclusion, resetting the “check engine” light is not always the best solution. Although it may seem like an easy fix, the light is a signal that something is wrong with your vehicle’s engine, and resetting it without addressing the issue can cause further damage.

However, if you have already fixed the problem and the light remains on, or if you have recently performed maintenance on your vehicle, resetting the light is a simple and easy process that can be done using a code scanner or by disconnecting the car’s battery.

Pro tip: If the “check engine” light comes back on shortly after resetting it, it’s best to take your vehicle to a mechanic for a thorough inspection to prevent any further damage.


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