Symptoms of a Bad or Failing Oxygen Sensor

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Cost of Replacing a Bad or Failing Oxygen Sensor

Common signs of a faulty car oxygen sensor include the Check Engine Light coming on, bad gas mileage, and a rough idle. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Oxygen Sensor Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2012 Volvo S60 $190 $119.68 $70.00 16% $227.18
2014 Bugatti Veyron 16.4 $322 $251.74 $70.00 10% $359.24
2003 Dodge Grand Caravan $249 $151.16 $98.00 17% $301.66
2007 Audi A8 Quattro $324 $134.92 $189.00 23% $425.17
2014 BMW 640i $485 $401.24 $84.00 8% $530.24
2010 BMW M5 $265 $159.55 $105.00 17% $320.80
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How to Diagnose a Bad or Failing Oxygen Sensor?

oxygen sensor

The oxygen sensor in your vehicle measures oxygen levels in the exhaust gases exiting the engine. This information is used by the Powertrain Control Module (PCM) to determine the correct air to fuel ratio for your engine in real time. The sensor is located in the exhaust system and allows the fuel injection and engine timing to work efficiently, which assists with emissions control. The oxygen sensor transmits the data to the vehicle’s PCM to maintain the optimal air to fuel ratio for your engine. A bad or failing oxygen sensor will have a negative impact on environmental emissions and engine performance, so there are a few things to watch out for before your oxygen sensor completely fails.

1. Check Engine Light comes on

The first line of defense is the Check Engine Light. The Check Engine Light will illuminate if you have a bad or failing oxygen sensor. As soon as this light comes on, contact a professional automotive technician for a Check Engine Light inspection. This light can come on for many different reasons, so it is important to have it looked at by a professional who can correctly diagnose the exact cause. If you have high a mileage vehicle, there's a good chance it has a bad oxygen sensor that needs to be replaced.

2. Bad gas mileage

If the oxygen sensor is going bad, the fuel-delivery and fuel-combustion systems will be thrown off. If a bad oxygen sensor disrupts the air to fuel ratio mixture, or too much fuel is injected into the engine, your vehicle's gas mileage will be reduced. If you find that you are filling up your gas tank more often, keep a record of how many gallons you fill up with and how often. If it is more than normal, have a professional mechanic check out your oxygen sensor.

3. Rough engine idle and misfires

As your oxygen sensor is going bad you may notice your vehicle is running rough, misfiring or running irregularly while idling. Since the oxygen sensor output helps control engine timing, combustion intervals, and the air to fuel ratio, a bad sensor can disrupt these engine functions, causing a rough or irregular engine idle.

When to replace the sensor

If your vehicle was manufactured within the past 15 years, the oxygen sensor should be replaced every 60,000 to 90,000 miles. This sensor is a wear item and does fail over time. Replacement of a bad or failing oxygen sensor will reduce the level of emissions your vehicle puts into the atmosphere, while keeping your engine running smoothly and properly. As soon as you notice your Check Engine Light, poor gas mileage, or an irregular engine idle, book a service with YourMechanic to have your oxygen sensor replaced. This will ensure your vehicle is running smoothly and efficiently, and will help prolong the life of your engine.

Check Engine Light
oxygen sensors
fuel economy
engine idle
Sensors

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YourMechanic Oxygen Sensor Replacement Service

Average Rating

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Number of Reviews

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Julio

24 years of experience
67 reviews
Julio
24 years of experience
very nice man talks to you about what he is doing and why
2005 CHEVROLET SILVERADO 1500 - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM, REAR/LOWER/DOWNSTREAM) - SAINT CLOUD, FLORIDA

Jerimiah

16 years of experience
207 reviews
Jerimiah
16 years of experience
Knowledgeable, efficient, personable, punctual. What more can be said.
1999 JEEP CHEROKEE - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM, REAR/LOWER/DOWNSTREAM) - LAS VEGAS, NEVADA

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Good work
2003 PONTIAC AZTEK - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM) - LOS ANGELES, CALIFORNIA

Robert

17 years of experience
436 reviews
Robert
17 years of experience
Very helpful, courteous and knowledgeable. Thanks!
2007 NISSAN MAXIMA - OXYGEN SENSOR REPLACEMENT (FRONT/UPPER/UPSTREAM) - BROOMFIELD, COLORADO

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