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Discussion Starter · #1 ·
Trying to figure out where the bank 1, sensor 2,o2 sensor and it's plug
are located. How many o2 sensors does a 2003, 9-3, sedan have?
I'd like to check the voltage before replacing the unit.
Thanks in advance...
 

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After the cat downstream... don't bother checking voltage its never the reason
 

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Their right... My cel is the same o2 and reads no activity detected but sometimes it also reads that it is too high at the same time. My front o2 voltage os between .30-.35 while the back is about .29. I think im going to go to vast the audi performance shop and grab an angled defouler and try that.
 

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Their right... My cel is the same o2 and reads no activity detected but sometimes it also reads that it is too high at the same time. My front o2 voltage os between .30-.35 while the back is about .29. I think im going to go to vast the audi performance shop and grab an angled defouler and try that.
That won't work because the car isnt reading that an 02 sensor is plugged in, hence the voltage suggestions. A de fouler will help cars read less emissions like when ppl remove cats.
 

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Discussion Starter · #6 ·
Hmmm...well, okay. If it's never the problem, then what would cause
the car to throw the code? I don't seem to be having any other issues.
 

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Hmmm...well, okay. If it's never the problem, then what would cause
the car to throw the code? I don't seem to be having any other issues.
What is the code exactly? If it's p0420 your sensor is probably ok but the cat is not doing it's job anymore or there is a leak in the exhaust system before the second sensor.

If it's a 'high voltage' or 'no activity' code just install a new sensor. After almost 10 it's useful life is over.
 

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Its never bad voltage is the point im trying to make, the sensor is bad
 

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Discussion Starter · #9 ·
Oops...the code I keep getting is a p0137. I'm slightly confused
by the last post. I too suspect the sensor is bad but to at least
try to confirm it, I would expect that I should measure the volt-
age coming off of it. Not that if the reading is out of range it
would have to be the sensor but it's a good place to start, I
suspect. I was responding to one post that it wouldn't be the
sensor and I was simply asking why not. I doubt it's ever been
changed but don't know how long the OEM units last. So I'm
thinking we agree then...it's a bad sensor?
Doesn't look like there are any exhaust leaks but that's a good
suggestion. I looked for vacuum leaks as well...
 
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