Skip to content
The Check Engine Light (CEL) is a warning indicator on your vehicle’s dashboard that alerts you to potential issues with the engine or emissions system. It typically lights up when something goes wrong, signaling that the vehicle needs to be inspected or repaired.
Common Causes:
-
Sensor Failures (e.g., oxygen sensor, mass air flow sensor)
-
Emissions Control Problems
-
Ignition System Failures (e.g., spark plugs, ignition coils)
-
Overheating Engine
-
Fuel System Issues
- Exhaust System Problems (e.g., catalytic converter failure)
Related Reading: How to Clear Check Engine Light with AD310
How to Use a Code Reader to Clear the Check Engine Light
Choose the Right Code Reader: Make sure your code reader supports the OBD2 protocol, which is standard for vehicles manufactured after 2000. Different car reader offer varying features, so it's a good idea to choose one that allows you to clear trouble codes (i.e., turn off the CEL). The Ancel AD310 or AD410 are both excellent choices for best car code reader.
Connect the Code Reader: Plug the OBD2 scanner into your vehicle’s OBD2 port. This port is typically located under the dashboard on the driver’s side, near the steering wheel or in the footwell area.
Turn On the Vehicle: Start the car (or turn the key to the “ON” position) to ensure the scanner can access the necessary data from the vehicle’s ECU (electronic control unit).
Read the Trouble Codes: Power on the code reader and select the “Read Trouble Codes” option. The scanner will communicate with the vehicle’s ECU and retrieve the relevant trouble codes (DTCs). These codes will help you identify issues in the engine or emissions systems.
Clear the Trouble Codes: Most OBD2 scanners come with a “Clear Codes” or “Clear Check Engine Light” feature. Once selected, the scanner will erase the trouble codes, which will turn off the CEL.
💡Important Notes
Clearing the codes doesn’t fix the underlying issue: It's important to understand that clearing the trouble codes doesn't resolve the actual problem that triggered the Check Engine Light in the first place. If the issue isn’t addressed, the CEL may come back on after a short period, even if the codes are cleared.
Don’t ignore recurring issues: If the CEL reappears after clearing the codes, it’s essential to investigate and repair the underlying problem. Continuing to drive with unresolved issues can lead to more serious damage to your vehicle and may affect its performance or fuel efficiency.
Clear codes only after repairs: It’s recommended to clear the codes only after you've addressed the problem. If you clear the codes prematurely, you may miss the opportunity to properly diagnose and fix the issue.
Use a reliable code reader: Not all OBD2 scanners are created equal. While many scanners offer basic functions, higher-end models may provide more detailed information, such as live data and advanced diagnostics, which can be useful for pinpointing the exact cause of the issue.
$39.99
$49.99
Why You Need A Car Code Reader
Perform a quick check: Before using a code reader, ensure that there’s no immediate issue that could be causing the problem, such as a loose gas cap or visible damage to the engine or exhaust system.
Address any obvious issues: If you’re familiar with car maintenance, you can check for simple issues like replacing a spark plug or fixing a vacuum leak yourself. However, more complex problems may require professional help.
Use a code reader as a diagnostic tool: Even if you’re not a mechanic, an OBD2 scanner can help you better understand what's happening under the hood. It provides valuable data that can guide you to the root cause of the problem, potentially saving you time and money by preventing unnecessary repairs.
How to Choose the Right Code Reader
When selecting a code reader, make sure it supports the basic functions like reading and clearing trouble codes.
For more comprehensive diagnostics, look for a scanner that also provides real-time data streaming and advanced features such as ABS and SRS system diagnostics.
While basic models may be more affordable, they may lack the in-depth capabilities needed for thorough diagnostics. If you require more extensive diagnostics, investing in a higher-end model (like Ancel V6 pro or Ancel Ds300) could be beneficial.
Compatibility
Ensure the scanner is compatible with your vehicle. While most modern cars (post-2000) are OBD2-compliant, some older models may require a specific tool. If you plan to use the scanner on various vehicles, opt for a universal model that can work across different makes and models, offering more flexibility.
Price vs. Performance
Consider how the tool fits your needs—whether you just need basic code reading or a more advanced diagnostic tool for in-depth analysis. For those who frequently work on their vehicles or need to diagnose more than just engine codes, investing in a more feature-rich scanner may save time and money in the long run.
Is it Worth Buying
If you frequently perform your own vehicle maintenance and diagnostics, owning an OBD2 code reader is an excellent investment.
It can save you money on diagnostic fees at the mechanic’s shop and allow you to catch problems early before they turn into costly repairs.
By identifying issues in the early stages, you can address them promptly, potentially preventing more significant damage and high repair costs later on.
For car owners with a basic understanding of vehicle maintenance, having a code reader is highly beneficial.
It allows for quick and easy diagnostics of engine issues, clearing the Check Engine Light (CEL), and even diving deeper into system problems by reading diagnostic codes.
Which Car Code Reader Brand is Worth Buying
Ancel is a top choice when it comes to car code readers. They offer a range of options, from best car code reader to wireless bluetooth obd2 scanner, professional-grade scanners. Trusted by many professional mechanics and auto dealers, Ancel is known for best car scanner's reliability and ease of use, making it a great option for both DIY car owners and professionals.
FAQs
Is it safe to drive with the Check Engine Light on?
If the vehicle is still running normally and there are no significant performance issues, you may be able to continue driving. However, if the light is accompanied by strange noises, loss of power, or poor performance, it’s best to have the car checked immediately to avoid further damage.
Will clearing the codes void my vehicle warranty?
In most cases, clearing the codes won’t void your vehicle warranty. However, if you’re troubleshooting and clearing codes before addressing a significant issue, it may prevent a dealer or technician from accurately diagnosing the problem. Always ensure the issue is resolved before clearing any codes to avoid complications with warranty claims.
Can I use a code reader to check for problems before purchasing a used car?
Yes, using a code reader can be a helpful step when inspecting a used car. It allows you to check for any existing trouble codes and potential issues with the engine or other critical systems, giving you an extra layer of confidence before making a purchase. However, it’s still recommended to have a professional mechanic inspect the vehicle as well.
