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4750 Kearny Mesa Rd, San Diego, CA, 92111

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Dealership Info

Phone Numbers:Sales Hours:
  • Mon - Fri9:00 AM - 8:00 PM
  • Sat9:00 AM - 7:00 PM
  • Sun10:00 AM - 6:00 PM
Service Hours:
  • Mon - Fri7:00 AM - 6:00 PM
  • Sat8:00 AM - 5:00 PM
  • SunClosed
Vans Service Hours:
  • Mon - Sat8:00 AM - 5:00 PM
  • SunClosed
Parts Hours:
  • Mon - Fri7:00 AM - 6:00 PM
  • Sat8:00 AM - 5:00 AM
  • SunClosed

How to Reset Your Check Engine Light

check engine light on

If you need to reset a check engine light, you can do so by disconnecting the negative battery cable or using an OBD II scanner. However, if you just learn how to reset your check engine light without fixing the initial problem, then the light will reappear instantly. Read on below. Our San Diego service team covers potential issues and solutions below, so you can reset your check engine light with confidence.

Why You Might Need to Reset a Check Engine Light 

Almost all vehicles have check engine lights, designed to alert the driver to a range of common problems. If the check engine light happens to appear as you’re traveling to San Diego or Rancho Santa Fe, it indicates that the engine performance is decreasing due to a failing mechanism. Usually, the issue has to do with one of the following:

  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

Keep in mind that the check engine light isn’t the only warning that might pop up on your dashboard. Before you try to reset it, explore our guide to the Mercedes-Benz maintenance schedule and make sure that any outstanding issues are resolved. 

How to Reset a Check Engine Light With a Scanner 

If you have an OBD II diagnostic scanner on hand, you can insert it under the steering wheel and quickly identify why the check engine light is on. As long as you know how to interpret the code, you can usually solve the problem by scheduling service or picking up what you need at our parts department. After the fix has been made, resetting the check engine light is as easy as one, two, three: Just insert the scanner again and press “clear” or “reset” to remove the code.

How to Reset a Check Engine Light Without a Scanner 

To reset a check engine light without a scanner, disconnect the negative battery cable and wait a few moments. This will reset the diagnostic system in your vehicle, and if the underlying issue has indeed been resolved, the light should go off immediately. Here’s how it’s done:

  1. Remove all jewelry, put on gloves and safety glasses, then turn off the vehicle and open the hood. 
  2. Locate the battery and negative terminal. It is black or has a minus (-) sign. 
  3. Use a wrench to loosen the terminal then hold the negative cable to the side for at least 30-60 seconds. Do not let cables touch. 
  4. Ask a friend to hold down the horn to drain additional power. 
  5. Reconnect the negative cable and put everything back in place.

Learn More Service Tips at Mercedes-Benz of San Diego

Contact us if you have any more questions on how to reset a check engine light. We’re happy to be a resource for all things related to service and maintenance. Ready to take on a more challenging task at home in San Diego or Del Mar? Check out our other DIY car care tips and tricks today.

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(833) 275-9841

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4750 Kearny Mesa Rd • San Diego, CA 92111

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Today's Hours:

Open Today! Sales: 9am-8pm

Open Today! Service: 7am-6pm

Open Today! Parts: 7am-6pm

Mercedes-Benz of San Diego 32.8241398, -117.1471697.