1999 Subaru Forester computer code for O2 sensors

1999 SUBARU FORESTER
110,000 MILES • 4 CYL • AWD • MANUAL
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DYBS
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Could you tell me which O2 sensor needs replacing if the code readout indicates "Sensor 1 Bank 2"?
The engine type is EJ253 - AWZVB. Thanks.
Mar 4, 2009 at 4:09 PM
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BLUELIGHTNIN6
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Hello Thanks for the donation Sensor 1 refers to the oxygen sensor closest to the engine. Bank 2 refers to the side that the number 2 cylinder is on. Below is a firing order diagram so you know which side is Bank 2 of your engine..


https://www.2carpros.com/forum/automotive_pictures/261618_Noname_282.jpg

You can always test the sensor before replacing it. To learn how to test an oxygen sensor, follow the link below.. https://www.2carpros.com/how_to/how_to_test_oxygen_sensor.htm Thanks for using 2CarPros.com!
Mar 4, 2009 at 4:25 PM
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DYBS
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So, am I replacing the sensor before the cat conv. or after it?
Mar 4, 2009 at 5:31 PM
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BLUELIGHTNIN6
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Starting from the rear of the vehicle and moving towards the front, it will be after the converter. One closest to engine.
Mar 4, 2009 at 9:11 PM