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

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1A Auto shows you how to remove, install, change or replace an oxygen O2 sensor. This video is applicable to the 02, 03, 04, 05 Chevy S10 Blazer and the GMC S15 Jimmy

This process should be similar on the following vehicles:
1983 Chevrolet Blazer S10
1984 Chevrolet Blazer S10
1985 Chevrolet Blazer S10
1986 Chevrolet Blazer S10
1987 Chevrolet Blazer S10
1988 Chevrolet Blazer S10
1989 Chevrolet Blazer S10
1990 Chevrolet Blazer S10
1991 Chevrolet Blazer S10
1992 Chevrolet Blazer S10
1993 Chevrolet Blazer S10
1994 Chevrolet Blazer S10

🔧 List of tools used:
• O2 Sensor Socket
• Wire Cutters

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⚠ DISCLAIMER:
While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

[AAuto]

√ *Watch the Video*
√ *Do it Yourself*
√ *Save Money*

[lloydsherman]

Excellent video. Camera shots very good, sound excellent good explanations. 5 stars and thanks.
Lloyd

[robertwortman]

You make it easier than I thought it would be. thank you

[Houseofhaha]

You guy ALWAYS have great and EASY to follow videos. Thanks again for your help!

[roadstar]

Excellent repair video's as always...

[supersharkk]

If the o2 has gone bad on the Chevy 4.3 get ready to change the lower intake gasket and possibly the fuel spider along with the upper intake plenum gasket o2s don’t go bad for no reason trust me I know 98 Chevy 1500 4.3 2wd ext cab fml if I would have known before smh I could have saved so much time on tracking down this problem anyways hope this helps some of you out there

[kevinengland]

I am working on a 98 jeep grand Cherokee and can only get one hand on the plastic clip are there any tools or tricks you know of to pull the two pieces together? I am on the upstream sensor.

[blutkaiser]

12 minutes of That'll be $300 please.

[roadstar]

I wish they would have said something about the issue effecting the way the blazer was performing rather than just showing code reader... i have had several codes come up then not come up then have other codes totally different come up dealing with same issue... of coarse i have a cheap reader and am an old school repair type of guy growing up in 60s and 70's before computers were around in homes and cars etc...thanks

[RM-mfdi]

1A Auto. Hi great videos but quick question. Do i need to disconnect the negative battery first before replacing an o2 oxygen sensor?

[alafrosty]

Note: Prior to installing the O2 sensor, put anti-seize compound on the threads otherwise the sensor will corrode into place, never to be turned again!

[gsanti]

Thank you the video helped fix my issue!!!

[HuntYoshi]

ok, i have p0171 and p0174, car idles fine at lights, it doesnt want to accelerate, it misfires when doing so, the oil pressure went up and down, would this be the same issue, if not, any suggestions?

[wendelllynch]

I have a 02 Chevy blazer (LS) 4WD and I have Bank one and Bank two Error. Do you sale the seniors? And are they both up stream or is one up and the other down.

[louishollandjr]

so on Sonoma Gmc all should be Along Exhaust pipe 02 sensors.?

[Ddham]

I have a 99 S10, 4.3L V6. I was told at the parts store that it has 4 O2 sensors. I have looked hard and only see 3. 2 are located right after the exhaust manifold (before the catalytic conv.) and 1 is located after the catalytic conv. Are there 4 or just the 3 that I can actually find?

[scubadivingsince]

I have a 99 chevy s10 4x4 5spd LS 4.3v6 I have a worn front drivers side hub assy ( ordered one ) and a Bad Cat ( Going to order one for 140-150.00 ) and I just figured it up and I'm getting 31.38MPG HELL YEAH and that includes some mud some gravel mainly highway, I pulled apart the different clip fitting under the hood and blew 'em out an reconnected them all good still :) but I'm going to replace all the o2 sensors and other sensors the above listed issues and all fuses :) plugs and wires right now I'm running some gunk complete fuel sys cleaner through half this tank half the next since its designed for a large or 35gal tank then ill change out the fuel filter again ( AGAIN ) and i'm going to add a economy programmer to my truck too :) mpg info is----218, 934-219, 366-13.764 yes 15yr old truck with almost 220k getting over 30mpg running Mobile 1 advanced full syn high milage 10w30 with a STP high mileage grey bottle additive oil with almost 3k in it and Lucas 75w90 full syn gear oil w id guestimate 10k 20k on the rhino clutch, synchromesh fluid and filter, also ordered a Wix oil filter, magnetic drain plug :) im going to attach a magnet to the filter too and one to the rear diff and the trans pan :) oh and regrease the ball joints and u-joint. etc greasing lol :( P I A pain in a-- :) if you have any suggestions please let me know :) thanks, great vids :)

[bballfan]

hi, I have a 2000 blazer lt and I wanted to ask if bank1 and bank 2 are the same exact sensors? I want to replace both but don't know if they are the same.

[SleepFaster]

My pipe does not have sensors between the exhaust manifold and catalytic converter. The only sensor I have is the one between the converter and muffler. Is this normal for a 1998 GMC Sonoma 2.2 L?

[slowmojoe]

is there supposed to be a plug or something on the transmission I can see the flywheel through a hole