How to Reset a Check Engine Light

Whether you drive a Mercedes-Benz or a model from another make, you can reset the check engine light by using an appropriate scanner or by disconnecting the negative battery cable. However, if you don’t resolve the underlying issue, you’ll see the light reappear almost immediately. We’ve covered common causes and solutions below, so you can learn how to reset your check engine light with confidence.

If There Is a Problem, Have It Resolved

Your Mercedes-Benz is unlike any other vehicle on the road. However, like many other models, your vehicle uses a generic “Check Engine” light in order to indicate declines in performance or failing components. If your check engine light has come on, it’s likely due to one or more of the following factors:

1. Loosened or damaged fuel cap
2. Failing oxygen (O2) sensor
3. Clogged or damaged catalytic converter
4. Malfunctioning Mass Air Flow Sensor
5. Expired or damaged spark plugs

If you’re driving around Rye or Stamford, scheduling service at Mercedes-Benz of Greenwich is the easiest way to solve the issue before it slows you down. If you have a scanner, you can also read the code and visit our store for any Mercedes-Benz parts you may require.

How to Reset a Check Engine Light Using a Scanner

More and more manufacturers are incorporating next-generation features and technologies in their vehicles, and New Canaan-area drivers are taking notice. If you purchase your own advanced OBD II diagnostic scanner, you can plug it in under the steering wheel and identify issues in a flash — as long as you know how to read the code! Resetting a check engine light is as easy as pressing “Clear” or “Reset” on your chosen scanner. However, it will return almost immediately if the issue isn’t dealt with.

How to Reset a Check Engine Light Without a Scanner

Disconnecting the negative battery cable for a few moments will force your Mercedes-Benz vehicle’s diagnostic systems to recalibrate. If an issue was previously solved, but the warning light failed to deactivate, take these steps:

1. Put on safety glasses and gloves, and remove all jewelry and metal from your person. Turn off the ignition, and open the hood.
2. Locate the battery, and locate the negative terminal. It is usually black and/or marked with a minus (-) sign.
3. Loosen the terminal using a wrench, and hold the negative cable to the side for 30-60 seconds. Don’t let the cables touch, or you may create dangerous sparks!
4. If you have a friend nearby, have them press the vehicle’s horn to drain any excess power from the vehicle.
5. Reconnect the negative battery cable and return everything to its place.

Keep in mind that disconnecting the battery may cause certain electronic systems to reset, so you may have some reprogramming to do!

Visit the Mercedes-Benz of Greenwich Service Center for Additional Help

Our service team knows how to solve any underlying issue you may face, whether you drive a Mercedes-Benz or a model from some other make! Explore our service and parts specials if you need to stop in, or continue your research with more of our DIY car care tips.

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