o2 sensor is toast

[IslanderTsi]

So I need to get a new one. Its the front one which accounts for my 7mpg average of late. Where can I pick one up the cheapest and how much of a pita is it to get at the front one?

 

[streetlegends]

So I need to get a new one. Its the front one which accounts for my 7mpg average of late. Where can I pick one up the cheapest and how much of a pita is it to get at the front one?

The cheapest place would be Advanced Auto I think, and it's not hard to get too at all once you take off the heat shield(exhaust manifold it should be on the right side, it's been awhile since I worked on a turbo eclispe).

 

[snoozin]

it's not getting to it thats a pita, it's getting it off. when i put on my exhaust i had to vise and heat it to glowing along with the assistance of overnighting it in pb and about a 3ft cheater bar to get it off. of course i'm sure it was the original one as well though.

ps. www.sparkplugs.com is the cheapest i've found a direct replacement. 47ish for denso, 79 for ngk

 

[brandons95]

I got mine at advance auto it was 108.00 for the front, for bosch. and is direct replacement

 

[navyguy07]

I did mine a little while back on my '98 GSX.

http://www.machv.com/denoxsen.html is where I purchased mine from. A little pricey, but I have never had bad service with them.

I can highly recommend some PB Blaster to losten it up, and a warm housing. It took me a couple of days and many swear words to finally realize a warm O2 housing was the way to go in loosening it. Oh yeah I think 22mm socket is the size too.

 

[elfroggo]

I don't think a bad o2 sensor would lead to 7mpg, something else is going wrong there. You will lose some efficiency, but it won't be nearly that off.

The upper heatshield is easy to take off, the lower one is a little more diffcult, it takes a little pulling to get the shield out from between the o2 housing and the dipstick.

The connector for the o2 sensor is located on the left side of the engine block. You will likely need to remove some pipes (intake/uicp) to access it better.

You should also remove the A/C fan, the right side, for more clearance.
You will need a special o2 socket to remove/ reinstall the o2 sensor. It costs $10-15. To remove the old o2 sensor, you can just cut off the tail and use a regular socket, but you still need an o2 sensor socket to install the new one.

Definetly use penetrant before trying to loosen the sensor.

*Remember to unplug battery before starting all of this*

 

[mathew82284]

I don't think a bad o2 sensor would lead to 7mpg, something else is going wrong there. You will lose some efficiency, but it won't be nearly that off.

The upper heatshield is easy to take off, the lower one is a little more diffcult, it takes a little pulling to get the shield out from between the o2 housing and the dipstick.

The connector for the o2 sensor is located on the left side of the engine block. You will likely need to remove some pipes (intake/uicp) to access it better.

You should also remove the A/C fan, the right side, for more clearance.
You will need a special o2 socket to remove/ reinstall the o2 sensor. It costs $10-15. To remove the old o2 sensor, you can just cut off the tail and use a regular socket, but you still need an o2 sensor socket to install the new one.

Definetly use penetrant before trying to loosen the sensor.

*Remember to unplug battery before starting all of this*

Or you could use a Wrench, Thats what i used to remove all 4 on my old mustang when changing the exhaust, They were a pita but u learned using the wrench worked better than the socket, I would just hit the other side of the wrench with a rubber mallet and it would come loose. I'm not sure how hard it will be to use a wrench on a eclipse probably have to remove more to make room but its up to you. Maybe someone else could chime in and see if it can be done or not.

 

[blazebolt]

I just changed my O2 sensor last week. It was very easy to do for me, once I figured out how to remove the connector. Remember it's 10x easier if you have the right tools. There is a O2 sensor socket that I believe you can rent for a deposit at autozone (they give it back when you return the tool). It is basically a deepsocket with a big slit cut into it so the wires can go through. With that tool and a little help from a breaker bar, the sensor came out no problem. No PB Blaster or heating it up was needed, although it would help.

You will need to remove only the Intake Pipe to get enough access to the connector. The connector is easy to disconnect (the other end pulls out, not the end with the O2 sensor attached), but it is mounted on a thin piece of metal (this is where I got stuck). To remove it, stick a small flat screwdriver between the connector and the metal piece and it should come out. Look at the new connector to see how it connects to the metal strip, that should help you figure out where to stick the screwdriver. Remove the connector first, that way you don't have the wire twisiting around while removing the sensor.