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Old 01-05-2012, 02:45 PM
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Heated oxygen sensor

My1995 Subaru 1.8 litre has a heated oxygen. What I have noticed is that the oxygen sensor is hot even when the engine is off for long periods of time. Is this normal? I am thinking it is an electrical issue so I have pulled the negative connector from the battery terminal. Is this a legitimate concern?

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Old 01-05-2012, 04:41 PM
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Originally Posted by seangarrison
My1995 Subaru 1.8 litre has a heated oxygen. What I have noticed is that the oxygen sensor is hot even when the engine is off for long periods of time. Is this normal? I am thinking it is an electrical issue so I have pulled the negative connector from the battery terminal. Is this a legitimate concern?
I doubt it should be heating while the car is off. I think it is a concern. You need to get a wiring diagram. Could be as simple as the O2 is shorted internally and providing a ground that is shouldn't be.

I am going to move this to the electronic engine controls section
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Old 01-05-2012, 04:51 PM
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It is a brand new sensor. I tested it before I installed it and even checked the electrical harness for voltage and both are good to specs. I am thinking that the term "heated" is actually suggesting that the sensor stay heated because of the electrical connection. I have had no bad problems with this car. However I just think it is strange that this sensor is holding a hot temperature when I connect the negative cable and the engine is off.
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Old 01-05-2012, 05:18 PM
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Originally Posted by seangarrison
It is a brand new sensor. I tested it before I installed it and even checked the electrical harness for voltage and both are good to specs. I am thinking that the term "heated" is actually suggesting that the sensor stay heated because of the electrical connection. I have had no bad problems with this car. However I just think it is strange that this sensor is holding a hot temperature when I connect the negative cable and the engine is off.
Is there 12 volts and ground on the heater pins when the car is off?
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Old 01-05-2012, 07:04 PM
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What exactly are the heater pins? I am getting the 12 volts but I'll have to check it again when the car is off.
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Old 01-07-2012, 05:42 AM
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Pins just referring to where the leads connect at the connector. Disconnect it and probe for voltage, key off.

There should be no voltage when the key is off.
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Old 01-10-2012, 05:30 PM
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How long is a "long time" after the car has been shut off. Keep in mind that with the temps those sensors see, they'll retain that heat for quite some time. If your skin doesn't melt when you touch it, it's probably been cooling for an hour or two at least .
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