Oxygen sensor replacement instructions?

CYNTHIA R SCOTT

MEMBER
2002 BUICK CENTURY
3.1L
6 CYL
2WD
AUTOMATIC
99,500 MILES

I have no codes relating to 02 and the heated 02 passes, but not the regular 02 sensor. The EVAP is failing as well codes p0449 and p0446 (no service engine light though, yet). EVAP has failed before without causing other things to fail or not complete.

9 Replies

KASEKENNY

MECHANIC
18,907 POSTS

This could be a couple of things. First and foremost it could be the o2 sensors, purge valve or a couple other items as well.

I attached the testing that we need to run through in order to figure this out for sure.

Here are some guides that will help with this:

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

However, I also attached the instructions on how to replace the o2 sensors as you requested.

Run through this material below and let us know if you have questions.

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Friday, February 12th, 2021 AT 6:45 PM

LR4RODNEYLEE

MEMBER
1 POST
2002 BUICK CENTURY
6 CYL
FWD
AUTOMATIC
140,000 MILES

The check engine light comes on. It called for bank one o2 sensor. So I went ahead and changed both o2 sensors. I cleared the code and it stayed off until she accelerated hard getting back on interstate. I thought maybe it was a faulty sensor so I replaced the first one again. Same result. Plus, the mileage isn't as good as it once was. Other than that a great car. Any help is appericated.

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Monday, February 15th, 2021 AT 9:58 AM (Merged)

2CARPRO JACK

MECHANIC
11,533 POSTS

What were the exact code? Slow reaponse? Heater circuit? There are several codes for the o2 sensors, and some are mixture codes that may be a problem with the fuel injection that is causing the o2 sensor to not be able to control the mixture

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Monday, February 15th, 2021 AT 9:58 AM (Merged)

FAB22

MEMBER
2 POSTS
1999 BUICK CENTURY
6 CYL
FWD
AUTOMATIC
185,000 MILES

Where are the o2 sensors located and how difficult are they to change? Also is there any type of computer resetting that has to be done?

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Monday, February 15th, 2021 AT 9:59 AM (Merged)

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Hi:
The O2 sensors are on the exhaust. One is upstream and one down stream (cat), and they almost look like a spark plug. They are easy to replace. They just screw out and in and have an electrical plug. However, I recommend that you purchase antiseeze and put some on the new sensor's threads before replacing them. Also, you don't need to do anything to the computer.

I hope this helps.

Joe

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Monday, February 15th, 2021 AT 9:59 AM (Merged)

FREELANCER

MEMBER
1 POST
1998 BUICK CENTURY

Engine Performance problem
1998 Buick Century 6 cyl Front Wheel Drive Automatic

how to replace o2 sensors

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Monday, February 15th, 2021 AT 9:59 AM (Merged)

BLACKOP555

MECHANIC
10,371 POSTS

Turn on vehcle and let it warm up. Be careful exhaust will be very ot.

With engine off locate oxygen sensor that needs replacement and disconnect the connector keepign it away from the hot pipes.

After that you will have to use a special socket or a box end wrench and procede to loosen it making careful not to strip it out or hit the hot exhaust.

When installing the new one use antiseize compound.

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Monday, February 15th, 2021 AT 9:59 AM (Merged)

DEERWENA