1999 Subaru Forester computer code for O2 sensors

Tiny
DYBS
  • 1999 SUBARU FORESTER

Computer problem
1999 Subaru Forester 4 cyl All Wheel Drive Manual 110000 miles

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.

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Wednesday, March 4th, 2009 AT 4:09 PM

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Tiny
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..


http://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..

http://www.2carpros.com/how_to/how_to_test_oxygen_sensor.htm

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Wednesday, March 4th, 2009 AT 4:25 PM
Tiny
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So, am I replacing the sensor before the cat conv. Or after it?

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Wednesday, March 4th, 2009 AT 5:31 PM
Tiny
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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.

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Wednesday, March 4th, 2009 AT 9:11 PM

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