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What is the function of the oxygen sensor?
An oxygen sensor, also known as an O2 sensor, is vital to your car’s engine management system. Its primary function is to monitor the oxygen levels in the exhaust gases and provide feedback to the engine control unit (ECU) for optimal fuel control. The oxygen sensor helps the engine maintain the correct air-fuel mixture by constantly analyzing the exhaust gases, ensuring efficient combustion and engine performance.
The oxygen sensor consists of a ceramic body with a sensing element, typically made of zirconium dioxide. This element generates a voltage signal based on the difference in oxygen levels between the exhaust gas and the ambient air. This voltage signal is then sent to the ECU, which adjusts the fuel injection and ignition timing accordingly.
Symptoms of a Failing Oxygen Sensor
- Check Engine Light Illuminates
- Decreased Fuel Efficiency
- Rough Idle and Engine Performance Issues
- Strong Odors from Exhaust
- Black Smoke from Exhaust
- Failed Emissions Test
- Unusual Engine Sounds
- Increased Engine RPM at Idle
How to replace oxygen sensor
Step1
Use an OBD code scanner to detect the broken sensor.
Step2
Let the engine cool before attempting to remove a sensor.
Step3
Jack up the vehicle if you need to reach a sensor under it.
Step4
Locate the oxygen sensor underneath the hood or vehicle.
Step5
Disconnect the electrical connection to the oxygen sensor.
Step6
Spray some penetrating oil onto the sensor to loosen it.
Step7
Unscrew the oxygen sensor using a ratchet wrench.
Step8
Select a new oxygen sensor that is the same as the old one.
Step9
Add a small amount of anti-seize to the new sensor.
Step10
Turn the sensor clockwise to secure it on the exhaust line.
Step11
Plug the electrical connector back into the vehicle.
Step12
Start the car to see if the problem is fixed.
Frequently Asked Questions by Customers
What happens if I don’t replace my oxygen sensor?
Usually, your Check Engine Light will remain on until it’s fixed. Also, it can cause emissions-related problems, you’ll fail a smog check, and you’ll burn more fuel than necessary in many instances.
How long does it take to replace an oxygen sensor?
It depends on your skill level and the complexity of your vehicle’s design. Allot an hour or two per oxygen sensor.
Can a bad oxygen sensor cause a check engine light?
Yes, definitely. If the oxygen sensor’s readings are outside of the normal range, it will trigger a Check Engine Light.
Can I replace an oxygen sensor myself?
It’s possible, yes. With common tools and a bit of time, you can change your own oxygen sensors. If you aren’t comfortable, bring it to a mechanic to get the job done.
Margot Ortiz
Reviewed in the United States on January 27, 2025
Fit perfect
Bob Strama
Reviewed in the United States on January 25, 2025
It shut off the Check Engine Light so it obviously works.
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