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Can I drive with the check emission light on?

The short answer is that it is generally not recommended to drive with the check emission light on. The check emission light, also known as the check engine light, is an indicator that there is an issue with your vehicle's emissions control system. Ignoring this warning light can lead to further damage to your vehicle and potentially result in failing an emissions test.


Understanding the Check Emission Light


The check emission light is part of your vehicle's on-board diagnostics (OBD) system, which monitors various components of the emissions control system. When the system detects a problem, the check emission light is illuminated on your dashboard to alert you that something needs to be addressed. This could be anything from a faulty oxygen sensor to a problem with the catalytic converter.


Potential Consequences of Driving with the Light On



  • Increased Emissions: When the check emission light is on, it means your vehicle is not operating at optimal efficiency, which can result in increased emissions of harmful pollutants into the environment.

  • Decreased Fuel Economy: A problem with the emissions control system can also lead to decreased fuel efficiency, costing you more money at the pump.

  • Further Damage to the Vehicle: Ignoring the check emission light can allow the underlying problem to worsen, potentially leading to more expensive repairs down the line.

  • Failing Emissions Tests: In many areas, vehicles must pass emissions tests to be registered or to renew their registration. Driving with the check emission light on can result in a failed test, which can be costly and time-consuming to resolve.


It's important to note that the severity of the problem can vary, and in some cases, the check emission light may be triggered by a minor issue that does not significantly impact the vehicle's performance or emissions. However, it's still best to have the problem diagnosed and addressed as soon as possible to avoid more serious consequences.


What to Do If the Check Emission Light Is On



  • Have the Vehicle Inspected: Take your vehicle to a qualified mechanic or an auto parts store that offers free diagnostic services to have the problem diagnosed and the appropriate repairs made.

  • Clear the Code: Once the problem has been addressed, the mechanic can clear the diagnostic trouble code that triggered the check emission light, turning it off.

  • Consider Temporary Driving Restrictions: If the problem is severe, the mechanic may recommend limiting your driving or avoiding certain driving conditions until the repairs are completed.


By addressing the issue that triggered the check emission light, you can help ensure your vehicle is operating safely, efficiently, and in compliance with emissions regulations.

How urgent is the check emission system?


This could be due to various issues such as a malfunctioning sensor, a problem with the catalytic converter, a leak in the exhaust system, or issues with the engine management system. It's essential to address this warning promptly as it can affect the vehicle's performance, fuel efficiency, and environmental impact.



How much to fix emission problems?


A: If your vehicle failed emission testing and it needs repairing, then the cost will depend on the exact cause, but the repair work typically starts around $200. Replacing your exhaust system depends on the type of car you drive, but that work starts at approximately $175.



How do I clear my check engine light for emissions?


If you see your check engine light, you can always give us a call or stop by our shop.

  1. Continue Driving and Let it Clear on its Own.
  2. Use an OBD2 Scanner.
  3. Turning the Ignition On and Off.
  4. Disconnect and Reconnect the Battery/ECM Hard Reset Technique.



How long can you drive with the check emission system light on?


50-100 miles
The answer is it is safe to drive from 50-100 miles. To maintain your car's health, it is always better to get it checked immediately when you see the check engine light.



Is emissions light serious?


Some common issues that trigger the warning light include a loose gas cap, a clogged air filter, a bad catalytic converter, a failing oxygen sensor, and other faulty engine sensors. You can still drive with an illuminated check emission light, but it's not recommended as it could lead to engine damage.



How many miles do I need to drive before emissions test?


Drive 100-200 miles after maintenance or battery replacement: If you've recently replaced your car's battery or had maintenance work done, it's important to put some miles on the car to help the vehicle's memory prepare for testing.



What to do if an emission light comes on?


What to do if your emission light comes on

  1. Observe. Check that there are no other symbols on your dashboard indicating additional problems, such as low oil pressure or overheating.
  2. Check gas cap.
  3. Reduce pressure.
  4. Check whether the engine light is constant or flashing.



Can I drive a car with an emissions light on?


It's fine unless the light is flashing. At that point you need to stop use immediately, as it's damaging the catalytic converter.



How do I fix my emissions light?


Diagnosing & Fixing the Problem

  1. Tighten or change your gas cap. Check the rubber seal on the inside of the gas cap to make sure there aren't any cracks or damage.
  2. Replace your air filter.
  3. Change faulty oxygen sensors.
  4. Take your vehicle to a mechanic.



How much does it cost to fix an emission system?


If your vehicle failed emission testing and it needs repairing, then the cost will depend on the exact cause, but the repair work typically starts around $200. Replacing your exhaust system depends on the type of car you drive, but that work starts at approximately $175.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.