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If your car’s dashboard light comes on, it’s usually because there’s an issue somewhere in the system.
These issues are often recorded in something called a diagnostic trouble code (DTC), which is stored in your car’s computer.
Sometimes, people clear these codes to turn off the warning lights, but is it a good idea? In this article, we’ll explain what really happens when you clear the codes.
What Are Car Trouble Codes
Your car’s computer constantly checks things like the engine, exhaust system, and transmission.
If it spots a problem, it creates a trouble code and usually turns on the warning light on your dashboard.
These codes help you or a mechanic figure out what’s wrong. Some common codes might point to problems with things like your engine, fuel system, or exhaust.
Related Reading: How to Read a Car Key Code
What Happens When You Clear the Codes
The Warning Light Turns Off – But That’s It
When you erase the codes by using obd2 scanner, the warning light on your dashboard goes away, which can be a relief.
But here’s the catch – erasing the code doesn’t actually fix the problem.
If there’s something wrong with your car, the light will probably come back on soon after you clear it. So, you might feel better for a little while, but the issue is still there.
You Lose Helpful Information
Another thing that happens when you erase the codes by the car diagnostic scanner automotive is that you lose all the data tied to that code.
This can be a problem if you ever need to figure out exactly what went wrong.
A mechanic uses that data to help diagnose the issue. So, by erasing it, you’re essentially wiping out clues that could make fixing your car easier.
Possible Problems With Clearing the Codes
Emissions Tests Could Be Affected
In some places, your car has to pass an emissions test to make sure it’s not polluting too much.
If you clear the codes too soon, your car may not be ready for the test. That’s because the OBD system needs time to run some checks after the codes are cleared.
If it hasn’t completed those checks yet, your car might fail the emissions test, and you’ll have to go back for a retest.
Ignoring the Problem Doesn’t Help
Clearing codes doesn’t solve the problem – it just hides it. If your car has a serious issue, like a misfiring engine, and you clear the code, the problem is still there.
The warning light will come back on, and you’ll have to deal with it again. In the meantime, the problem might get worse, which could lead to bigger repairs down the line.
Risk of Damaging Your Car Further
In some cases, ignoring a warning light and clearing the code with can make things worse.
For example, if there’s a problem with your engine, ignoring it could cause even more damage over time. What started as a small issue might turn into a major repair if you don’t take care of it right away.
When Should You Clear the Codes?
After You’ve Fixed the Problem
The best time to clear the codes is after you’ve actually fixed the problem.
If you replaced a broken sensor or repaired a faulty part, clearing the codes will turn off the warning light and reset the system.
This ensures that the OBD system knows everything is working properly again.
To Check If the Problem Was a One-Time Thing
Sometimes, you might want to clear the code to see if the problem comes back. If your car’s warning light came on after you hit a pothole, you might clear the code and see if it stays off. If the light comes back on, it means the problem is still there.
This can help you figure out if it’s a recurring issue or a one-time fluke.
How to Clear the Codes the Right Way
Use an OBD2 Scanner
One easy way to clear codes is with a car diagnostic scanner Ancel AD310. This tool plugs into your car’s computer and lets you read and erase codes.
Many people use them to check on their car’s health and clear minor issues.
Some advanced car diagnostic tool even give you detailed information on what the code means, so you can decide whether it’s worth clearing or not.
Ask a Mechanic
If you’re not sure what a code means or whether it’s okay to clear it, it’s always a good idea to ask a mechanic.
They can check out the code with obd2 scanner, figure out if there’s a real problem, and guide you on whether you should clear it or leave it alone.
Key Takeaways
Clearing car trouble codes can provide a quick fix for annoying dashboard lights, but it’s not always the best solution.
Erasing codes does not address underlying issues, and it can lead to complications if left unchecked.
While it’s okay to clear codes after repairs, always prioritize diagnostics and repairs over simply removing warnings. Taking the right approach ensures your vehicle remains safe, functional, and compliant with emissions regulations.
FAQs
Can clearing the codes affect my car's emissions test?
Yes, clearing the codes can interfere with your car’s emissions readiness. After you erase the codes, the OBD system needs time to run its checks. If the system isn’t fully ready, your car may fail the emissions test.
What happens if I clear the codes but don’t fix the problem?
If you clear the codes without fixing the problem, the issue will likely come back. Ignoring the warning could lead to more severe damage over time, which can result in higher repair costs.
Is it safe to clear the codes myself?
It’s safe to clear the codes as long as you know the issue has been resolved. If you're unsure about what the code means or if the problem is serious, it’s best to consult a mechanic before clearing the codes.
