What happens if you remove downstream O2 sensor?

With the O2 sensor removed, your ECU can no longer calculate how much fuel should be injected. The ECU will fallback to its default value and always inject the same amount of fuel every time. This could cause either low performance or horrible fuel economy.

Is the downstream O2 sensor important?

Input from the downstream O2 sensor(s) is used to detect any problems with the converter(s), and to fine-tune fuel trim. Replacing both sensors is recommended to restore like-new performance and fuel economy. Downstream O2 sensors tend to be longer-lived because they are behind the converter and exposed to less heat.

When should the oxygen sensor be replaced?

As a thumb rule, you may consider replacing your oxygen sensors every 65,000 to 90,000 miles , if your vehicle is less than 15 years old. This will reduce pollution and keep your car engine running efficiently. If your car is older than 15 years, it is best to replace the O2 sensors every 50,000 to 65,000 miles.

How do I replace oxygen sensor?

Step 1: Identify the faulty sensor. Step 2: Raise the vehicle. Step 3: Disconnect the oxygen sensor connector. Step 4: Remove the oxygen sensor. Step 5: Compare the faulty oxygen sensor with the replacement sensor. Step 6: Install the new oxygen sensor. Step 7: Clear the codes. Step 8: Start the vehicle.

How do you remove oxygen sensor?

Remove the oxygen sensor by unscrewing it from the exhaust pipe, using a ratchet and oxygen sensor socket. If the sensor is seized, heat its base with a propane torch, then loosen it. Allow the sensor to sit until it is cool, then continue removing it.

What are the signs of failing O2 sensors?

Reduced gas mileage