Menu

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

How to Replace O2 Oxygen Sensor 02-05 Chevy Blazer S10

Share on:

How to Replace O2 Oxygen Sensor 02-05 Chevy Blazer S10

Created on: 2013-11-08

Watch this video to learn how to replace an oxygen sensor in a 02-05 Chevy Blazer S10.

  1. step 1 :Removing the Oxygen (O2) Sensor
    • Pull the pin out of the O2 sensor wiring harness
    • Disconnect the wiring harness
    • Unclip the wiring harness from the vehicle using pliers
    • Cut the harness clip with wire cutters if necessary
    • Remove the O2 sensor with an O2 sensor socket and ratchet or a 7/8 inch wrench
    • Pull off the O2 sensor
  2. step 2 :Installing the New O2 Sensor
    • Feed the new O2 sensor into place by hand
    • Tighten the O2 sensor with an O2 sensor socket and ratchet or a 7/8 inch wrench
    • Connect the O2 sensor wiring harness
    • Push the pin into the wiring harness
    • Clip the harness to the vehicle

Tools needed for replacement

  • Pliers, Cutters & misc Wrenches

    Needle nose pliers

    Wire Cutters

  • Ratchets & Related

    Ratchet

  • Specialty Tools

    O2 Sensor Socket

  • 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 an O2 sensor on this 2003 Chevy Blazer S10 with the 4.3 liter V6, and it's the same part and process in a large variety of GM vehicles.

We're going to start off by showing you that we plugged in an OBD2 sensor to find out what the check engine light was, and it gave us these error codes: 154 and 155, which ended up being a upstream O2 sensor.

So, if you come under the vehicle here you'll see, this is your downstream O2 sensor, and then up front here this is your bank one upstream O2 sensor, and this over here is your bank two upstream O2 sensor. This one is the one that has the issue. You just want to start off by pulling out the blue pin on the harness for the O2 sensor and then disconnecting that harness. The harness is clipped to the vehicle. You just want to pull that out. You can use a pair of pliers to help you remove it. You'll notice Don gets a little impatient and just cuts it. You can do that too because you're going to have a new one anyways. You can buy a socket specifically for the O2 sensors. You can buy that at 1AAuto.com. For this particular oxygen sensor, I'm just using a 7/8 inch wrench. It's a better solution, but for the other two sensors on this vehicle the socket might be a better solution. Now, using a wrench, you just want to loosen up and remove your O2 sensor. We'll just fast forward as Don loosens this up the rest of the way.

The old part is in the back; the new O2 sensor from 1A Auto is in the front. You can see they're identical. The new one just has a clip that hasn't been cut. You just want to feed your new O2 sensor up into position and just twist it in. It's easier to just twist it in by hand, and then once you get it most of the way, tighten it up the rest of the way with the wrench. Now just reconnect your harness and slide that blue pin back into place and re-clip your harness to the vehicle and you're all set.

We hope this video helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.

Tools needed for replacement:

    Pliers, Cutters & misc Wrenches

  • Needle nose pliers
  • Wire Cutters

  • Ratchets & Related

  • Ratchet

  • Specialty Tools

  • O2 Sensor Socket

  • Wrenches - SAE

  • 7/8 Inch Wrench

2000 - 2002  GMC  Yukon
2000 - 2000  GMC  Sierra 2500
2002 - 2002  GMC  Sierra 1500
2002 - 2004  Isuzu  Rodeo
2004 - 2004  Isuzu  Axiom
2002 - 2002  Honda  Passport
2003 - 2004  Isuzu  Ascender
2000 - 2002  GMC  Yukon XL 1500
2002 - 2002  GMC  Yukon
2002 - 2004  Chevrolet  S10 Pickup
2000 - 2002  Chevrolet  Silverado 1500
2001 - 2005  Chevrolet  Monte Carlo
2001 - 2005  Chevrolet  Impala
2001 - 2003  Chevrolet  Malibu
2002 - 2005  Chevrolet  Blazer
2002 - 2002  Chevrolet  Avalanche 1500
2003 - 2004  Chevrolet  SSR
2000 - 2000  Chevrolet  Silverado 2500
2002 - 2002  Chevrolet  Silverado 1500
2003 - 2004  Chevrolet  Trailblazer EXT
2001 - 2005  Chevrolet  Venture
2002 - 2002  Chevrolet  Tahoe
2000 - 2002  Chevrolet  Tahoe
2000 - 2002  Chevrolet  Suburban 1500
2000 - 2002  GMC  Sierra 1500
2000 - 2002  GMC  Safari
2002 - 2004  GMC  S-15 Sonoma
2004 - 2004  GMC  Envoy XUV
2003 - 2004  GMC  Envoy XL
2000 - 2003  Cadillac  Seville
2000 - 2002  Chevrolet  Astro
2002 - 2002  Cadillac  Escalade
2000 - 2004  Cadillac  Deville
2000 - 2002  Cadillac  Eldorado
2004 - 2004  Buick  Rainier
2002 - 2005  Buick  Rendezvous
2001 - 2005  Buick  Century
2002 - 2003  Isuzu  Rodeo Sport
2004 - 2004  Isuzu  Rodeo
2001 - 2004  Oldsmobile  Silhouette
2001 - 2003  Oldsmobile  Aurora
2000 - 2002  Oldsmobile  Intrigue
2001 - 2004  Oldsmobile  Alero
2001 - 2002  Oldsmobile  Aurora
2001 - 2003  Pontiac  Grand Prix
2001 - 2005  Pontiac  Montana
2001 - 2005  Pontiac  Aztek
2001 - 2005  Pontiac  Grand Am

00-05 Buick Cadillac Chevy Olds Pontiac Multifit Oxygen Sensor

O2 Oxygen Sensor DIY Solutions EMS00437

Part Details:

  • LS Swap
  • Direct Fit Replacement - Guaranteed to fit and function for your specific application
  • Quality Tested - built to a strict level of product standards.
Auto Repair How Do I Check or Add Brake Fluid to My Car or Truck

Auto Repair How Do I Check or Add Brake Fluid to My Car or Truck

This video will show you how to check and replace brake fluid in your car or truck. It's quick and easy, and a good thing to do each service!

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...