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Why You Have an O2 Sensor (Oxygen Sensor)

Posted June 5, 2022 11:05 AM

If someone asked you what gas made up the largest portion of the atmosphere, what would you guess? Well, it's not oxygen; it only makes up 20.9 percent.  But since we're talking about oxygen, you should know that your vehicle uses oxygen sensors to make sure your engine is running the way it should.

The oxygen sensors measure how much oxygen is in your exhaust.  If there's too much, it means there's a problem with the mixture of fuel and air.  The sensor sends signals to computers in your engine and adjusts the mixture so it maximizes performance and efficiency.  It does this constantly. 

Many vehicles have multiple oxygen sensors.  Some have one close to the engine, another close to the muffler.  Two measurements are better than one since they allow readings to be more accurate.  You may have a vehicle with a dual exhaust, so you'd have twice as many oxygen sensors.

Your oxygen sensors can fail.  One thing that can damage them is contamination from bad fuel.  The sensors can simply wear out, though they usually last a long time.  It's not unusual for an oxygen sensor to last 100,000 miles/160,000 km. One more thing that can cause an oxygen sensor to fail is residue from an engine that's burning oil.  Plus contaminants from the road like salt can also cause problems. 

Here are some signs that your oxygen sensors might be failing.

  • The Check Engine light goes on.  In this case, your service facility can plug in a device that will read the code in your engine's computer to see if that's the problem.
  • The engine is running roughly.
  • Black, sooty smoke is coming out of your tailpipe.
  • Your fuel economy is noticeably lower than it used to be.

Head to your service facility and tell your advisor what symptoms your vehicle is experiencing.  They have the equipment and training to track down the issue.  Note that simply replacing the oxygen sensor is often not enough since it doesn't get to the root of the problem; other repairs may be needed. 

So make sure your oxygen sensors are working the way they should be.  Oh, and back to the question of what gas makes up most of the Earth's air?  It's nitrogen, which comprises 78 percent of the air we—and our engines—breathe.

Alternative Automotive
137 S Vinewood St
Escondido, CA 92029
(760) 480-0851
http://www.alternativeautoescondido.net



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First experience with Alternative Automotive was a great one. My car broke down and Daniel and the team had me in and out in no time and back on the road. They were very professional and honest to work with. I will definitely be back next time I need service for my autos.
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, 06/11/2022

Jeff is an amazing service advisor ready to help you get your car serviced and any needed repairs done quickly and reliably.
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Daniel and George are great! Friendly, knowledgeable, and fair!
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Best automotive shop in north county. Highly recommended.
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, 02/22/2022

Alternative Automotive provided great customer service and Daniel was outstanding in professionalism and knowledge! I have already recommended some of my friends to take their vehicles to them! We will be taking all of ours there for service for sure. Great experience and fair prices!
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, 02/06/2022

Crazy noise and then smell burning rubber, never good. Got it towed to Alternative Automotive and they diagnosed, fixed and got it back to me for less than I expected! I trust them.
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