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What Voltage Should Rear O2 Sensor Read? '97 960 S90-V90

posted by  WrenWright on  Sat Jan 25 21:39 CST 2014
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last visit: Mon Oct 20 07:51 CST 2014
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One my scanner, my rear O2 sensor is reading 0 volts consistently. From what I've read, the front sensor should fluctuate between .2V and .8V or so, which it is doing. However, regarding the rear sensor, I've come across some conflicting information. I've read that it should be a steady ~.4V but I've also read that it should be 0V unless something is out of whack with the Catalytic converter.

I've got a constant PO172 code; the check engine light comes on occasionally but then goes out. From what I've been reading, that is from a vacuum leak of some sort, although I can't find one.

I'm thinking that I've got a dead rear O2 sensor. I checked the connector and everything seems to be OK. The car runs fine and gets good gas mileage.

What sort of voltage should I be seeing from the rear sensor? If the sensor is dead, would that give the engine code that I'm seeing? Thanks!





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