Subject	Before buying new o2 censors, get them checked!
Posted by	Draker (Eugene, OR) on April 13, 2010 at 6:01 PM
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In Reply To	Black residue on tailpipes. First thoughts ?? posted by abozx on April 13, 2010 at 04:54 PM
Message	Or check them yourself! If you don't have a scope/visual meter, you should take it somewhere that has one. It takes less that 5 minutes to check. Voltage should fluctuate from .2v-.8v, and if it doesn't, either you are running rich/lean or then are broken. If they don't produce a voltage, obviously they are bunk. I believe there is a procedure in the FSM to check these as well. Keep in mind these cannot be checked with a regular meter, the voltage moves to fast to measure. Don't just blindly change your O2 sensors, it's a waste of money and time. You wouldn't change injector cause you felt it was bad, you would verify it was bad first. Same deal with O2s.
Follow Ups	Black residue on tailpipes. First thoughts ?? - abozx 16:54:30 04/13/10 O2 sensor (n/m) - aliaZ 17:21:15 04/13/10 Before buying new o2 censors, get them checked! - Draker (Eugene, OR) 18:01:06 04/13/10 FSM procedure works fine -no need to go elsewhere - Zarcasm(Hfd, CT) 18:13:51 04/13/10 2nd. no need for any special equipment (n/m) - aliaZ 18:53:17 04/13/10 Yeah looks like FSM method will work as well. - Draker (Eugene, OR) 01:57:46 04/14/10 MIL light on? - Drk93TT 21:34:55 04/13/10 New o2 sensors and no engine light. - abozx 23:12:25 04/13/10 Don't forget the cooling system thermostat. If water>> - ZUL8TR 05:52:41 04/14/10 thanks guys, I am going to try the thermostat this weekend - abozx 22:15:04 04/14/10 why not verify that the thermostat is faulty - aliaZ 22:37:24 04/15/10 Agreed, easiest to do with an infra red temp gun. The dash>> - ZUL8TR 07:51:39 04/16/10
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