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Why You Have an O2 Sensor (Oxygen Sensor)

Posted September 26, 2021 8:59 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.

Long Hill Auto Service
1905 Long Hill Rd
Millington, NJ 07946
(908) 647-7984
http://www.longhillautonj.com



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A few weeks back my wife was driving from PA to NYC by herself and started to have some car trouble. She called me from route 78 and I advised her to get off at the next exit and head to the closest repair shop. Thankfully it was Longhill Auto. At the end of their business day they got right on checking the car out, and were gracious with my wife who was having a very stressful experience. They were in touch with me every step of the way. Ultimately performed the necessary repairs and thoroughly test drove the car to give us peace of mind it was in good shape before making the hour plus drive out to pick it up. Would definitely recommend them and even going out of your way to work with them as it isn’t always easy to find a good shop with great people.

, 03/13/2024

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, 02/16/2024

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Long Hill Auto is the best auto service shop in the area, hands down. The staff is well trained and highly knowledgeable. Their facility is well organized and cared for, which shows how important it is for them to pay attention to details. Bob runs a great shop that can handle all of your automobile needs. They are friendly, affordable, and have a fast turnaround on their jobs. I don't think it can get much better than that.

, 01/25/2024

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