Menu

1A Auto Video Library
Our how-to videos have helped repair over 100 million vehicles.

How To Replace Rear Downstream Oxygen O2 Sensor 03-07 Cadillac CTS

Share on:

How To Replace Rear Downstream Oxygen O2 Sensor 03-07 Cadillac CTS

Created on: 2015-05-02

Need to replace the downstream O2 sensor on your 03-07 Cadillac CTS? We'll show you how in this video!

  1. step 1 :Removing the Oxygen (O2) Sensor
    • Raise and secure the vehicle
    • Disconnect the oxygen sensor wiring harness
    • Remove the O2 sensor with a 7/8" wrench
  2. step 2 :Installing the New O2 Sensor
    • Apply anti-seize grease to the O2 sensor threads
    • Twist the new O2 sensor into place
    • Tighten the O2 sensor with a 7/8" wrench
    • Connect the O2 sensor wiring harness
    • Lower the vehicle to the ground

Tools needed for replacement

  • General Tools

    Jack Stands

    Floor Jack

  • Materials, Fluids, and Supplies

    Anti-Seize Grease

  • Wrenches - SAE

    7/8 Inch Wrench

Installation Video
Watch video

Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet.

Hi, I'm Mike from 1A Auto. I hope this how-to video helps you out, and next time you need parts for your vehicle, think of 1AAuto.com. Thanks.

In this video, we're going to show you how to replace the downstream, or number 2 oxygen sensors on this Cadillac CTS, with a 2.8 liter. You'll need new oxygen sensors from 1AAuto.com, a 7/8"� wrench, and a jack and jack stands.

You'll want to lift your vehicle up, and there are arrows right on the side. That's where you'll want to place your jack, and then the jack stand to support it.

The right side is bank 2. The rear sensor, you can see here behind the catalytic converter. That would be bank 2, sensor 2, and then the front catalytic, or upstream catalytic would be bank 2, sensor one. Then, there is bank one, sensor two, and bank one, sensor one is the upstream.

If you want to replace one of the O2 sensors, you'll need to unplug it. They usually have a safety latch which you pull out, and then there's a tab that you push up and disconnect.

The downstream, or 2nd sensors on each side are pretty easy to reach with a 7/8 wrench, and you can see it just takes a good couple pulls, and then the sensor breaks loose. Twist it right out.

The new sensor will usually come with some anti-seize that you want to place on the threads,. Then twist it right in until it's seated. Then, use your 7/8"� wrench and tighten it up nice and firm. Then, just reconnect the harness, line it up, and make sure you push it in place until you hear the tab click on, and then set the safety pin as well.

Thanks for tuning in. We hope this video helped you out. Next time you need parts for your car, please visit 1AAuto.com. Also, check out our other helpful how-to, as well as, diagnosis videos.

Tools needed for replacement:

    General Tools

  • Jack Stands
  • Floor Jack

  • Materials, Fluids, and Supplies

  • Anti-Seize Grease

  • Wrenches - SAE

  • 7/8 Inch Wrench

2005 - 2007  Cadillac  CTS
2005 - 2009  Cadillac  CTS
2005 - 2006  Cadillac  SRX
2005 - 2009  Cadillac  SRX
2005 - 2006  Cadillac  STS
2005 - 2009  Cadillac  STS

03-07 CTS w/2.8L; 05-06 SRX; 05-07 STS w/3.6L; 06-09 STS w/4.6L Downstream O2 Sens LR = RR (AC)

Cadillac CTS SRX STS O2 Oxygen Sensor ACDelco 213-2823

Part Details:

  • Direct Fit Replacement - Guaranteed to fit and function for your specific application
  • Quality Tested - built to a strict level of product standards.
Search Videos
Go To Top

Same Day Shipping

Need your part faster? Choose expedited shipping at checkout.

Guaranteed To Fit

Highest quality, direct fit replacement auto parts enforced to the strictest product standards.

USA Customer Support

Exceeding customers' expectations, our team of passionate auto enthusiasts are here to help.

Instructional Video Library

Thousands of how-to auto repair videos to guide you step-by-step through your repair.

Loading...