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1996 02 sensor locations?

I am getting a check engine light and my mechanic says I need O2 sensors. I want to buy them but I need to know how many and where they are located.

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  • Cars & Trucks Master
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I am not doubting your mechanic, but I like to see a printout of your ODBII test results, to back up his recommendations. I can give you a quick low cost procedure to follow. 1) Change your air filter often( every 30,000 miles) 2) fuel filter(every 20,000 Miles) and add a can of B&G44K fuel additive to the fuel, it is the best on the market. It will condition your fuel pump and injectors. Its only available through Dealerships and should no be substituted (11.00 a can at Toyota). After running for a week, go back to your mechanic and request a print out of your OBDII scan and go from there. Everything I have mentioned here is cheaper than the cost of 02 sensor replacement which in your case is most likely only one sensor.

Posted on May 15, 2017

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Posted on May 15, 2017

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Posted on Jan 02, 2017

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2 Answers

2003 chevy aveo #1 O2 sensor


#1 is the up-stream sensor (The O2 sensor located before the Catalytic Convertor). #2 is the down-stream O2 sensor. This sensor is located after the Catalytic Convertor. I hope this helps, let me know if you have other questions concerning this issue. Good luck.

Mar 18, 2014 | Cars & Trucks

2 Answers

How to replace oxygen sensor


At Autozone, Oreilly's, NAPA, etc, you will need to buy an O2 sensor socket. This looks like a normal socket but it's longer and has a slot running 3/4 of the way down one side. This slot is to hold your wiring harness to the side as you unscrew the O2 sensor.

First, be sure you're working on the right O2 sensor. Any auto parts store can diagnose this and get you the exact one. Many cars now have 2-4 or even more O2 sensors. Now, when they diagnose it they may say it's the front 'left bank' sensor or some other car lingo talk. Just let them point out to you which is the one causing your check engine light to come on so you know for sure. Also be sure you're buying the right O2 sensor wrench. I believe there are 3 or 4 sizes.

I dont do this, but most manuals would now tell you to disconnect your battery. Once its disconnected, find the O2 sensor in question and disengage the wiring harness. Just look it over until you see how it works, push down the plastic tab and it will pop right out. Now you'll have an O2 sensor sticking out of your exhaust with a wiring harness hanging on it. Use some PB Blaster to penetrate the threads and it will come out much easier. With O2 socket, remove. Replace. Reconnect harness. Reconnect battery. Fixya!

P.S. - I had a Ford Bronco that would constantly (every 3-6 months) show a check engine light and the RPMs would bounce back and forth when I started it. Turns out it was the O2 sensor. After replacing a few, an old mechanic told me to take it out and place the sensor end in acetone or gasoline for about 5 - 10 minutes. (not fully submerged, only the business end) Once you take it out, you can brush it off with a hard nylon or light metal brush, then repeat. Once the acetone has dried off, replace O2 sensor using steps above. Disconnect battery for a few minutes to clear the check engine code. Now, some say this doesn't work, but I can tell you from experience it definitely can. And, if the sensor is already showing bad, you could save $30-$120 depending on the cost of the O2 sensor.

Good luck!

Good luck!

May 01, 2011 | 2004 Buick LeSabre

2 Answers

O2 sensor type and location for 3.8 liter engine


there are 4 o2 sensors the 2 up towards the engine are called the upstream and the 2 after the converters are called the downstream . heres a picture to help you understand there locations. hope this helpsonetufshoppe_121.gif

Feb 12, 2011 | 1998 Ford Windstar

1 Answer

Need to know how to check the oxygen sensors on a 1996 saturn sl


Don't know if this will answer it. O2 sensors send info to the computer to make adjustments to the emissions system. Over time the O2 sensors fail which cause the computer to light the "Check engine" light. Originally the "Check engine" light was dedicated to an emission system fault. Now manufactures use it for a variety of abnormalities. To know what the "check engine" light means you have to either take it to a mechanic or buy a OBDII scanner (around $100) and read the code yourself. I like to read my own codes. These scanners are good for all modern cars. Instructions are included EZ to follow.
Long story short, don't worry about it the check engine light will come on when O2 sensor fails. Happy motoring!

Mar 11, 2010 | 1996 Saturn SL

1 Answer

I have a 2005 Chrysler Town & Country with almost 100,000 miles. The check engine light came on about 2 months ago and the code said the O2 sensors needed to be replaced. About a month later, the...


there are no codes that say replace O2 sensors,or remove converter,Thats just somebody's guessing,When it says O2 sensor that tells the mechanic to look for trouble in that area,wiring or faulty readings,And there are four O2 sensors.

Jan 20, 2010 | 2005 Chrysler Town & Country

3 Answers

Engine warning light on Mazda MPV 2002


There seem to be 4 sensors along the way in the air intake and emissions system.

My Check Engine light indicated a bad sensor 1, bank 2 code (I think).

I had my mechanic replace the sensor that was indicated as faulty... cost = $191.

Then the Check Engine light came on again (with a different code), and I had to leave the van with him all day.

Cost to replace and install that sensor = $115.

My advice: if the Check Engine light stays on *AND* your vehicle is riding rough, get it fixed.

Otherwise, put a piece of tape over that Check Engine light and save a couple hundred dollars!

Hope this helps, I do trust my mechanic fully.

Aug 17, 2009 | 2002 Mazda MPV

2 Answers

I need to know what the definition for fault code


The #2 O2 sensor on the cataylitic convertor,could be caused by a bad sensor or bad convertor.

Jun 22, 2009 | 1998 Jeep Cherokee

1 Answer

Check Engine Lights On


if the code is for the rear cat o2 sensor i suggested to replace the cat. the rear o2 sensor is to tell the commputer ha good is the cats if the cat not burning the gas. the commputer need to see the o2 sensor to check the cat's

Apr 17, 2009 | 2000 Toyota Corolla

1 Answer

Don't know what type of sensor I need for my 93 Regal


If your check engine light is on the computer in your car can give a code. Aamco will read your check engine light for free. Might need a repair manual to find out what code means (which o2 sensor). If check engine light is not on you will probably need to get each o2 sensor tested by a mechanic.

Apr 02, 2009 | 1993 Buick Regal

1 Answer

Check engine on


o2 sensor is usually located on the manifold of most 4 cylinder engines they are normally a one wire connection. you will need the following:

New oxygen sensor....these can be really expensive.
a open end wrench that fits the O2 sensor, or an O2 sensor socket and a ratchet to loosen and tighten the O2 sensor

Start by driving the car to get the car warm o2 sensors can be very hard to get out if they are cold.

if you think you might burn yourself on something hot put thick gloves on, you will have to disconnect the on wire on the o2 sensor, unfortunately you cant wear gloves while doing this, so be extremely careful as the exhaust will be very hot.

After wire disconnected loosen o2 sensor by going counter clock wise using either a o2 sensor socket or a appropriate wrench

while wearing gloves, after the sensor is loose enough unscrew by hand, remember it is still very hot.

you can let engine cool down now if you want.

put new o2 sensor in tightening it firmly and replug the electrical connector back up.

if your check engine light does not go out take to autozone and have them reset your computer, or you can disconnect your battery cables for 20+ minutes and this resets the computer also.

Aug 09, 2008 | 1996 Mercury Mystique

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