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what's mean of atmospheric pressure sensor -check engine on?

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hi, my 1991 non-turbo wagon works well but check light on. The trouble code is #45,atmospheric pressure sensor-faulty sensor. So, what's possible reseason for that? I appreciate for kind instruction. I also try to clear the code with battery out and fuse disconnection, neither of such ways work. What's should I do then?

guoqing

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The atmospheric sensor is used by the ECU to make changes to fuel mixture as the air pressure changes. This helps when you drive over mountain passes.

 

It sounds like you may need to just replace it. Check the wiring to it first before replacing it, and make sure things are ok there.

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it is an external sensor. I am not sure where it is on here, been ages since I have seen one. On newer subarus it is on the passenger side strut tower, and has a hose attached to it as it does double duty, on yours I dont remember

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It is not external on the EA82 cars.

 

It's built into the ECU.

 

Turbo models only had a "pressure sensor" but that's really about boost sensing.  Not Atmosphere.

 

Latter models do have MAP sensors.....but not in EA82....it's in the ECU.

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It is not external on the EA82 cars.

 

It's built into the ECU.

 

Turbo models only had a "pressure sensor" but that's really about boost sensing.  Not Atmosphere.

 

Latter models do have MAP sensors.....but not in EA82....it's in the ECU.

 

and for the ea81t? 

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hi, my 1991 non-turbo wagon works well but check light on. The trouble code is #45,atmospheric pressure sensor-faulty sensor.

 

Code 45 is not Atmospheric control.

 

Code 45 for a 91 Loyale would be for "kickdown control relay"

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