Skip the auto shop - Our mechanics make house calls

How Long Does an Air Fuel Ratio Sensor Last?

air fuel ratio sensor

If you have a car that was made after 1980, then you have an air fuel ratio sensor. It is a component in your emissions control that sends information to your engine computer in order to help it run efficiently while producing as little as possible in the way of emissions. The gasoline engine in your car uses oxygen and fuel in a specific ratio. The perfect ratio depends on how much carbon and hydrogen are present in any given amount of fuel. If the ratio is not perfect, then fuel is left over – this is referred to as a “rich” mixture, and it causes pollution due to unburned fuel.

A “lean” mixture, on the other hand, doesn’t burn enough fuel, and emits too much oxygen, resulting in other types of pollutants called “nitrogen oxide” pollution. A lean mix can result in poor engine performance, and even damage. The oxygen sensor is located in the exhaust pipe, and it delivers information to the engine so that if the mixture is either too rich or too lean, it can be adjusted. Because the air fuel ratio sensor is used every time you drive, and because it is exposed to contaminants, it can fail. Usually, you will get anywhere from three to five years out of your air fuel ratio sensor.

Signs that your air fuel ratio sensor needs to be replaced include:

  • Poor fuel economy
  • Sluggish performance

If you think that your oxygen sensor needs to be replaced, or if you are experiencing other problems related to emissions control, you should have your vehicle checked out by a qualified mechanic. They can diagnose any problems that you may be having with your emissions control system, and if necessary, replace the air fuel ratio sensor.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: Stalling and surging

Hi and thank you for contacting YourMechanic. The best thing to do is to hook a scanner to your vehicle and retrieve any codes if possible. Yes, there is a very good possibility that your MAP sensor is faulty. The...

Q: Gas mileage down

First off, spark plugs are not going to affect fuel mileage. Also, how are you checking fuel mileage? If you are using the indicator on your dashboard or overhead console, this isn't perfectly accurate. The only accurate way is to...

Q: It will not start on starting fluid, it dies right away. Replaced fuel pump, fuel compressive regulator, and fuel filter

Hey there. If the motor will only start with the use of starting fluid, this suggests you may have a fuel supply problem such as faulty or dirty fuel injectors. If you have replaced the fuel pump and fuel pressure...