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So I got a couple of trouble codes after the last scan which said that my H2O sensors 1 and 2, in bank 1, are not working correctly. After googling for some time I found out that you can check with multimeter if the electrical circuit and the sensor itself is ok or not. What I couldnt find is the values im supposed to get by reading ohms and voltage.
What I did:
1. Checked the 1st sensor ohms and got 5 ohms when the engine was warm, 4.3 ohms when it cooled down.
2. Checked the voltage on the connector between contacts 3 and 4 (see the picture) and got 0.39V with the ignition off.
Are these values ok and is there anything else I can check before buying a new sensor?
269055
 

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incorrect testing, start by posting the exact codes in the form of Pxxxx .. but its almost impossible for both sensors to fail at the same time, unless u had the light since long a time ago and u ignored it until the second sensor failed
 

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What's the mileage on the current sensors? If it's 100k or more, you should probably replace them anyway. The O2 sensing cell gets disabled over time by soot buildup inside.
 
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