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Hi All,
I have a Astra G 1.8 and have been getting a random check engine light coming on. Put the scanner on it and got P0140 O2 SENSOR CIRCUIT NO ACTIVITY - DETECTED BANK 1 SENSOR 2. I assumed sensor #1 is the one before the cat and sensor #2 is the one further back under the car?
The odd thing is that when I checked the live data sensor #1 was showing odd numbers, jumping between 0.135mV then 0.800mV then 0.095mV. Whereas sensor #2 was showing anywhere between 0.410mV to 0.425mV on the 10 minute test drive. Why would I get a fault code on sensor #2 when its reading seems in spec and no fault code for sensor #1 which seems well out of spec?
Could anyone provide some help with this before I spend money on a replacement O2 sensor.
Thanks, BB
 

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Sensor 1 should go from approx 0.1v to 0.9v in a up and down swing.

Get the car warm and record some live data and put some propane into the intake and see if the rear sensor reacts. Also find a downhill and see if sensor 2 drops to near zero on over run. If not then it's probably dead or wiring issue.
 
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