<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MatterMatt &raquo;</TD></TR><TR><TD CLASS="quote">I think, but I am not sure, that Lo V for Switch translates to Low Voltage reading and Hi V for Switch means High voltage reading. If that is what those mean, the lowest voltage is .4 and the highest is .55, it is stagnant and will need to be replaced. I very well could be wrong because the scan tool I use is much different than yours.
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Ya, the numbers didn't change at all, drove it maybe ~8 miles round trip up/down steep *** hills and flat ground and such...everything 'cept awhile at a constant speed.

I'm kind of getting annoyed that my catalyst monitor isn't readying.

I'm not sure what those numbers mean, I think the same as you though, b/c it says "MEAS" which I'm guessing stands for "measurement" so I'd say low is .4 and the high is .55...but that doesn't exactly tell you a lot.

 

If your scantool took min and max readings of your primary O2 sensor and .4/.55V were the numbers, then your O2 is probably shot, unless you've got an actual electrical problem.

They don't last forever. I don't expect much more than 75-90k miles out of mine. I generally got 40mpg in my stock 99 hatch but when the O2 got to have about 60-70K+ miles, it would start to waver a bit. Sometimes it'd dip down to 35mpg on one fill up and be back up to 40 on the next. Replace it and it went back to a consistent 40mpg.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">If your scantool took min and max readings of your primary O2 sensor and .4/.55V were the numbers, then your O2 is probably shot, unless you've got an actual electrical problem.

They don't last forever. I don't expect much more than 75-90k miles out of mine. I generally got 40mpg in my stock 99 hatch but when the O2 got to have about 60-70K+ miles, it would start to waver a bit. Sometimes it'd dip down to 35mpg on one fill up and be back up to 40 on the next. Replace it and it went back to a consistent 40mpg.</TD></TR></TABLE>

Yeah, gas mileage is still 100%.

It's simply that this is my beater for however long, it's got blowby (I think, it's burning a bit of oil, gotta add some stabilizer and dump some 15w50 to see if I can slow it up. I picked it up for 500, it needed a headlight combo switch (50 bux), wipers (20 bux), inspection (20 bux) (whatever the registration fee was), so I got like 200 into it now. I don't wanna spend another nickel on it, but I can get an O2 sensor from a junkyard depending on how much they want for it.

The other problem is I think the TPS is going out the window, jerky, non-responsive, slow responsive, it threw a CEL for the TPS way back, but it never came back on..but the throttle's been acting queer as hell.

So I think I need a new TPS and a new primary O2...

Well if that don't put a dent in the beater plans, eh?

So seeing as according to you guys this sensor should be like a sine curve between .1 and 1.v, there's something seriously ******* wrong with the sensor if it's stuck with a min of .4 and a max of .55?

I don't think it's the wiring b/c both the O2 sensor monitor and the O2 sensor heater monitor checked out "ok"

The catalyst monitor still hasn't cleared up yet...but ****, took like 800 miles to clear up on my EJ8...

 

Scintillating conversation about your Tercel aside, I'm betting a new sensor fixes the problem Gotta pay to play, balla.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Archidictus &raquo;</TD></TR><TR><TD CLASS="quote">Scintillating conversation about your Tercel aside, I'm betting a new sensor fixes the problem Gotta pay to play, balla.</TD></TR></TABLE>

LoL

I gotta see what deals I can get .

 

If you replaced it and still didn't fix it, i would put money on it you have a wiring issue. Try running lines directly from the sensor to the ECM, if you really want to remove the harness from the circuit and have known good wires.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 200kCivicSI &raquo;</TD></TR><TR><TD CLASS="quote">If you replaced it and still didn't fix it, i would put money on it you have a wiring issue. Try running lines directly from the sensor to the ECM, if you really want to remove the harness from the circuit and have known good wires.</TD></TR></TABLE>

I haven't replaced it yet. I might in the near future though....seems to be running fine, the pending code hasn't turned into a hardcode yet .