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No data from O2 sensor

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Old 05-10-2011, 04:49 PM   #1
CoreyF [OP] CoreyF is offline
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No data from O2 sensor

1999 Toyota Tacoma 2.7L 4x4 standard cab DLX.

I have installed CAREFULLY the upstream and downstream O2 sensors that were purchased from Toyota dealer. This cleared up the sensor errors I was getting with my OBTD scanner tool. I am pretty sure my catalyst is failing because I keep getting the check engine light periodically and the scan code is P0420. I have to keep clearing this code after driving a little while. I can't find any exhaust leaks that could be causing this either and I have CAREFULLY cleaned the MAF sensor too with the correct cleaner.

When I do an O2 scan once in a while I notice that I get "no data found" from the downstream sensor and it just shows a "?" mark.

My question is if the catalyst is not working correctly could this cause this sensor to show no data or should I get this sensor tested even though it is fairly new?

Is it possible I'm not heating it up enough to get a scan result?

Below is what my scanner printed out.

IM Monitors


Since DTCs Cleared

Misfire Monitor ok
Fuel System Mon ok
Comp Component ok
Catalyst Mon ok
Htd Catalyst n/a
Evap System Mon ok
Sec Air System n/a
A/C Refrig Mon n/a
Oxygen Sens Mon ok
Oxygen Sens Htr ok
EGR System Mon ok

Confirm Selection
1999


Codes

DTCs


P0420 Mod $10
Catalyst Efficiency
Below Threshold Bank
1

O2 Monitor Tests


O2 Bank1 Sensor1

Lo V for Switch
MAX: -----(V)
MEAS: 0.350(V)
MIN: -----(V)
MOD: $10

Hi V for Switch
MAX: -----(V)
MEAS: 0.550(V)
MIN: -----(V)
MOD: $10

No data from O2 Bank1 Sensor2?
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Old 05-10-2011, 05:42 PM   #2
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Here is a video of how to test an o2 sensor.

http://www.youtube.com/watch?v=stFhLSHsOGg
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Old 05-16-2011, 06:57 PM   #3
CoreyF [OP] CoreyF is offline
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I would like details though on how to test with my DMM without a propane bottle. I'm not sure what to probe exactly on the downstream sensor connector for one thing. My repair manual has no details in it either just general info.
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