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Old 02-08-2009, 11:24 AM   #1
Coolabie
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Default Oxygen Sensor Replacement

On my 2004 4-Cyl, 5-speed Vue, I finally broke down and replaced the front oxygen sensor. My check engine light has been coming on and off for the last 10K miles, so I changed it at 121K miles. It was surprisingly easy to change. Start by removing the "triangular" aluminum shield behind the engine, held down by three half-inch bolts. This exposes the O2 sensor. Disconnect the electrical connector, while pulling up on the retaining tab that holds the connector together. Use an oxygen sensor socket to unscrew the sensor, which came out very easily. Replace with an OEM type sensor that has the correct electrical connection, (I used a Bosch), and DO NOT OVERTIGHTEN.
This is, potentially, a ten-minute job. I am not a mechanic and it took me 20 minutes. I paid $11 for the O2 socket and I paid a ridiculously high $80 for the sensor. I believe the sensors for Japanese cars are half that price. My local Saturn dealer wanted $139.

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Old 02-14-2009, 08:01 PM   #2
thermalfinder
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Default Re: Oxygen Sensor Replacement

I think my 02 VUE has 2 ox sensors; before and after cat. I wonder whether I should replace both sensors if it has 2?

Could defective ox sensor(s) affect mileage?

- Jim S.

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Old 02-14-2009, 10:30 PM   #3
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Default Re: Oxygen Sensor Replacement

Quote:
Originally Posted by thermalfinder View Post
I think my 02 VUE has 2 ox sensors; before and after cat. I wonder whether I should replace both sensors if it has 2?

Could defective ox sensor(s) affect mileage?

- Jim S.
The answer is YES. Plus if you don't change then when they go bad you could damage the catalytic convertor.

...
Previously Owned 98 SL2, Sold
98 SL, Sold
When your Saturn is well kept YOU are well kept.

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Old 02-15-2009, 10:09 AM   #4
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Default Re: Oxygen Sensor Replacement

actually the price isnt bad..i just got rid of my 91 prelude and those o2 sensors where anywhere from 65 dollars(cheap) will def fail..to over a 100 dollars..80 for a bosch is exactly what id expect to pay..cheers on doing urself..esp after 121k trying to do it when ur car has 232,000 oy vay!

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Old 02-15-2009, 10:07 PM   #5
andyr13
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Default Re: Oxygen Sensor Replacement

The '04's have 2 sensors correct? Our light is on, and I was told it is the rear O2 sensor.

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Old 02-16-2009, 09:05 AM   #6
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Default Re: Oxygen Sensor Replacement

The front sensor is the most important one because it tells the computer to change the fuel mixture. It will affect fuel economy. The rear one just checks to see if the Cat is working. The direct fit ones are best since the voltages are low and any losses through a splice may change what the computer does. Bosch has a bit of a sketchy reputation for O2 sensors, I've had good luck with Denso sensors.

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Old 02-16-2009, 06:24 PM   #7
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Default Re: Oxygen Sensor Replacement

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Originally Posted by westwind999 View Post
The front sensor is the most important one because it tells the computer to change the fuel mixture. It will affect fuel economy.
That a good tip, thanks I think I'll replace the pre-cat ox sensor and try to have the other tested.

- J

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Old 02-24-2009, 12:03 AM   #8
Marz04
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Default Re: Oxygen Sensor Replacement

My 04 2.2L has a check engine light and its a code saying its running too rich. I'm guessing its time to change the front sensor. I'm searching around for a good price on one. Retail is like $130, the cheapest I can get one is like $75.

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Old 02-27-2009, 05:24 PM   #9
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Default Re: Oxygen Sensor Replacement

like i said before those 02 sensors esp the ones with the wire harness already on so all u have to do is unsnip and snip, ur going to pay any where from 50-130 bucks..good luck!

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Old 03-14-2009, 02:58 AM   #10
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Default Re: Oxygen Sensor Replacement

Replacing O2 sensors is a waste of money before 200,000 miles!

I know, your thinking I am full of it But really, you do not need to spend that money just yet.

Buy the $11.00 O2 socket. Pull the sensor/s out of the pipes and use a can of electrical cleaner (CRC pt# 05018)($5.29us) on each. it is the same thing as brake cleaner but it does not leave any residue to foul up the sensor.

I have been using this stuff for the past 10 years or so on both my wife's toyota and my vue. Every 50,000 miles or so, I pull the sensors and blast them with a can of the stuff. Let them dry, then reinstall. Works just fine.

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Old 03-14-2009, 09:23 AM   #11
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Default Re: Oxygen Sensor Replacement

What if there has been a lot of fuel just dumping through the motor due to a misfire, would your plan still work?

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Old 03-20-2009, 04:25 AM   #12
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Default Re: Oxygen Sensor Replacement

Yes, it will still work. it may take more than one can, but unless the sensor is physically damaged, a good cleaning is all it needs to make it work well again.

Alternatively, if you have a major amount of goo on the sensor, buy a can of SEAFOAM, pour some in a container and soak the sensor in it for about 5 minutes. then spray it very well.

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Old 07-11-2012, 12:32 PM   #13
Hotboi
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Default Re: Oxygen Sensor Replacement

Hey guys. I replaced the o2 sensor on the cat because for some odd reason the sensor connector was too close to the exaust and melted it. luckly it was not melted together where i could not disconnect it, but anyway. the o2 sensor was replaced but the other wire which connects im guessing somewhere from the engine block was a lil melted. i was able to reconnect but in case it fails on me can i get a replacment of that whole other wiring? the engine was o hot to see where that wire runs from. Anyone knows this?

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Old 07-13-2012, 05:47 PM   #14
bk63
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Default Re: Oxygen Sensor Replacement

Quote:
Originally Posted by Coolabie View Post
On my 2004 4-Cyl, 5-speed Vue, I finally broke down and replaced the front oxygen sensor. My check engine light has been coming on and off for the last 10K miles, so I changed it at 121K miles. It was surprisingly easy to change. Start by removing the "triangular" aluminum shield behind the engine, held down by three half-inch bolts. This exposes the O2 sensor. Disconnect the electrical connector, while pulling up on the retaining tab that holds the connector together. Use an oxygen sensor socket to unscrew the sensor, which came out very easily. Replace with an OEM type sensor that has the correct electrical connection, (I used a Bosch), and DO NOT OVERTIGHTEN.
This is, potentially, a ten-minute job. I am not a mechanic and it took me 20 minutes. I paid $11 for the O2 socket and I paid a ridiculously high $80 for the sensor. I believe the sensors for Japanese cars are half that price. My local Saturn dealer wanted $139.
Consider yourself lucky that this took care of your light. I had a steady light and could not find a code reader on earth to read it and had to go to my local shop. 350 bucks later he replaced the O2 sensor and charged big time which was the purpose of a recent post of a cheap code reader I recently found that saved me from more big bucks.

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