How to Reset Your Check Engine Light in San Diego, CA

check engine light on

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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.

That’s where our San Diego, CA Mercedes-Benz service center comes in. Our Mercedes-Benz service professionals cover a myriad of service issues and can help find solutions to your vehicle’s problems. If your check engine light recently came on and you’re not sure what caused it, schedule a Mercedes-Benz service appointment at our San Diego service center today!

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Before you bring your vehicle in to be serviced, be sure to browse our Mercedes-Benz service specials. San Diego-area drivers will find service specials on oil changes, brake pad replacement, car detailing, wheel alignment and more! Take a look today and use our special offers toward your next Mercedes-Benz service appointment.

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 Mercedes-Benz OEM parts 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.

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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