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Discussion Starter #1
I have a 1999 Forester with 112,900 miles. My mechanic just told me that I need to have two O2 sensors (front and rear) replaced (causing the "check engine" light). The catalytic converter was replaced in 2002. Is it normal for these sensors to go bad? How much damage will it cause if I don't get them replaced for awhile - I got a quote of over $500 for parts and labor, which I don't have right now.
 

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Premium Member
2009 Fozzie XT Ltd 4EAT
Joined
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553 Posts
yeah, o2 sensors get burned out over time

$500?, what a rip

your car should run okay, you just won't be able to get it inspected with that trouble code

you need to make sure that both need to be replaced, ask teh mechanic to show you the scan or go to autozone and have them scan it for you

I think the parts for both are like $200 - send a pm to subiegal

you can easily install them yourself
 

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scarred from battle
Joined
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730 Posts
you can also buy generic bosch replacements for less, if you want (I think peaty has the part #s over at scoobymods) but the OEM ones do perform a little bit better.
 

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The Modfather
2019 Impreza 5dr Sport - Manual
Joined
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8,063 Posts
First off welcome :)

Second 500 is pretty steep if you ask me. You can do it yourself a lot cheaper. The front sensor (before the cat) will effect your MPG's and eventually the performance. The rear one will not effect anything other than making the light come on.

The front you should change anyway if you haven't in that many miles. Some info here for the front:

http://www.scoobymods.com/forums/showthread.php?t=1039

Some of the best prices are here:

http://tinyurl.com/cng8k

The thing is for the front (MY 99) one you will have to look at your door plate to see the build date. They switched types mid year.

The front can cost between 60 and 70 ish depending the rear is around 113 USD. Get the OEM type not only are they cheaper but they plug right in no problem.

Now if it were my car I'd forgo replacing the rear since you have so many miles, the part is expensive and it only makes the light come on and will not effect anything else. I would install a mechanical fix instead, that only costs about 5 bucks. Have a look here for info on that:

http://www.scoobymods.com/forums/showthread.php?t=5468

Since you have a relatively new cat I'm wondering why the rear is throwing a CEL. Either the sensor is bad or possibly you have some sort of leak before the sensor cooling down the air throwing off the the sensor. Might be worth a look under there for carbon tracks that would indicate a leak. Or get under there bu the cat and have a friend hold their hand over the end of the tail pipe for a few seconds (with a gloved hand) and listen for an exhaust leak. It will make a hissing noise.

The whole process can be done while the car's front wheels are on ramps. Best to have the proper tool though. AutoZone will lend out an O2 sensor removal tool for free you only need to leave a deposit. While you are there they can also pull the OBD2 codes for the CEL. Make sure it is your front and rear sensor. No point in doing the rear if you don't have to. I still say do the front anyway, it's so old and it can only improve your MPG's.

Have a look here for more info on the proper tool:

http://www.scoobymods.com/forums/showthread.php?t=5464

So for about 80 bucks you can do it yourself, then take your SO to dinner or something with what you save :)

Peaty.

PS if you can't see the pics in my links you will need to register on our ScoobyMods site but it's free.
 

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scarred from battle
Joined
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730 Posts
and, of course... I beat peaty himself by a mere second or two... take his advice and get the OEM one - i didn't realize they were that cheap.
 
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