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> Is It Possible To Clean The Oxygen Sensor?, Clean or replace?
tomellis
post Feb 12 2008, 05:10 PM
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I have a 94 850 turbo and have been getting a 2-3-2 fault code for awhile. It was suggested by someone on this forum that I may need a new oxygen sensor. I believe that someone else said that it is possible to clean the sensor and save the almost $200 it would cost to replace it.

So here's the question! Can the sensor be cleaned, and if so how do I clean it? My Haynes manual makes it sound like any attempt to clean the sensor will immediately kill it and force replacement. But if some of you fellow thrift-minded 850 owners know differently I'd like to hear from you.

Thanks in advance for any help!
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TheGreekMason
post Feb 12 2008, 05:22 PM
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there is a post on the 850 forum on how to do it. if i remember correctly, you need to soak it in fuel, everyday remove it and shake it out to remove the gunk and place back in the fuel. that should do the trick. remember, no smoking :grin:
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tomellis
post Feb 12 2008, 05:41 PM
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I hate to sound stupid, but I tried various search terms regarding "cleaning oxygen sensor 850" and got many pages of results that were almost all irrelevant. Am I doing something wrong on the search?
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TheGreekMason
post Feb 14 2008, 08:05 PM
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just try oxygen sensor. if i find it in the interim, i will pm you with the post.
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70 140
post Feb 15 2008, 10:46 AM
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I think it was from this thread:

http://www.volvo-forums.com/t17930-code-172-sometimes.htm
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ampangbear
post Feb 18 2008, 07:25 AM
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QUOTE(tomellis @ Feb 13 2008, 06:10 AM)
So here's the question!  Can the sensor be cleaned, and if so how do I clean it?  My Haynes manual makes it sound like any attempt to clean the sensor will immediately kill it and force replacement.  But if some of you fellow thrift-minded 850 owners know differently I'd like to hear from you.


[right][snapback]72166[/snapback][/right]



The good thing for you is that, even IF you screw-up, the sensor is already written-off by the OBD system, right? :)

But trust me, it'll take an EFFORT to screw up the instructions below:-

1) Buy a long thin liquid container that is safe for petrol. I used an old water container that has outlived its life on my office-desk.
2) Preferably, it should have a cap, so that petrol/gas/fuel doesnt evaporate away within the first few hours.
3) Remove your o2 sensor, or sensors.
4) Put petrol/gas/fuel into the container.
5) Visually inspect the O2 sensor for any damages, wire-cuts or physical damages that could possibly hinder it from performing its natural designated duty
6) Dip sensor into the petrol/gas/fuel.
7) Close container.
8) Stir the petrol in the container. No need to shake it vigorously.
9) Leave overnight.
10) Next day, stir again. At the same time, take note of the debris at the bottom of the container. It's all the things that are stopping the sensor to perform its duty to measure the emissions.
11) After a few hours, stir again.
12) Leave overnight again (if you wish).
13) Or, fit it into the 02 welded bung on the exhaust piping.
14) Eradicate the error message.
15) See / observe if the message comes again.


Disclaimer: There have been a very few times, where the cleaning has no impact. By then, you'd know that the O2 is not salvagable already. If that is the case, your 'cleaning' process would have effectively only costed you the little petrol that you use and now must be thrown out. Small price to pay for a test, eh?

:)

Good luck!

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ampangbear
post Feb 18 2008, 07:26 AM
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QUOTE(tomellis @ Feb 13 2008, 06:10 AM)
So here's the question!  Can the sensor be cleaned, and if so how do I clean it?  My Haynes manual makes it sound like any attempt to clean the sensor will immediately kill it and force replacement.  But if some of you fellow thrift-minded 850 owners know differently I'd like to hear from you.


[right][snapback]72166[/snapback][/right]



The good thing for you is that, even IF you screw-up, the sensor is already written-off by the OBD system, right? :)

But trust me, it'll take an EFFORT to screw up the instructions below:-

1) Buy a long thin liquid container that is safe for petrol. I used an old water container that has outlived its life on my office-desk.
2) Preferably, it should have a cap, so that petrol/gas/fuel doesnt evaporate away within the first few hours.
3) Remove your o2 sensor, or sensors.
4) Put petrol/gas/fuel into the container.
5) Visually inspect the O2 sensor for any damages, wire-cuts or physical damages that could possibly hinder it from performing its natural designated duty
6) Dip sensor into the petrol/gas/fuel.
7) Close container.
8) Stir the petrol in the container. No need to shake it vigorously.
9) Leave overnight.
10) Next day, stir again. At the same time, take note of the debris at the bottom of the container. It's all the things that are stopping the sensor to perform its duty to measure the emissions.
11) After a few hours, stir again.
12) Leave overnight again (if you wish).
13) Or, fit it into the 02 welded bung on the exhaust piping.
14) Eradicate the error message.
15) See / observe if the message comes again.


Disclaimer: There have been a very few times, where the cleaning has no impact. By then, you'd know that the O2 is not salvagable already. If that is the case, your 'cleaning' process would have effectively only costed you the little petrol that you use and now must be thrown out. Small price to pay for a test, eh?

:)

Good luck to you!

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tomellis
post Feb 18 2008, 12:32 PM
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Thanks very much! My wife will whine about not having her car for a day or two but I think we'll survive. I'll let you know how things turn out.
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tam85
post May 6 2010, 08:24 PM
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hey tomellis, whats up? wat happen to your sensor? if you are still interested heres another one on how to clean your oxygen sensor.. goodluck! http://www.ehow.com/how_4797809_clean-oxygen-sensors.html
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tomellis
post May 6 2010, 08:59 PM
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Sorry about that, I never reported back after cleaning the oxygen sensor. I followed Ampangbear's instructions and it worked great. No more error message about the O2 sensor! Saved a few bucks, hopefully the sensor will continue to work forever! (IMG:style_emoticons/default/57.gif)
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