Some contaminants like anitfreeze will hose both O2 sensors. Otherwise, the
rearward basically monitors the condition of the catalytic converter, while
the forward one tells the PCM the A/F mixture. I believe the forward one is
more likely to go bad. But if you are changing one, it's probably a good
idea to change both (if the wallet allows). As for cleaning them, I believe
that T/B or carb cleaner can be used. You can test them with an ohmmeter to
see if they are still within working parameters. Per my 98 FSM, "disconnect
the O2Sensor connector. Connect the ohmmeter test leads across the white
wire terminals. Resistance should be between 4.5 +/- .5 and 7 ohms.
Replace the sensor if the ohmmeter displays an infinity (open) reading."
Hope that helps.
TonyC
-----Original Message-----
From: jay & dana <jay&dana@telus.net>
To: DML <dakota-truck@buffnet.net>
Date: Monday, December 31, 2001 5:51 PM
Subject: DML: O2 sensors
>In my 97, 318 Dak I have 2 O2 sensors (1 before and 1 aft the cat). Which
>one of these would be most likely to crap out first? And if changing one
>would it be a good idea to change them both at the same time? Also is
there
>anything that you can add to the fuel to help keep the O2 sensors clean?
>
>Thanks, and a safe and Happy New Year to all,
>TTYL in 02
>Jay & Dana
>
>
>
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