Emissions and Exhaust Systems
Subaru Outback

Where is the O2 sensor bank 1 sensor 1 on a 2000 Subaru outback?

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2008-11-25 05:55:04
2008-11-25 05:55:04

yes, it's threaded into the front of the front catalytic converter. that's bank 1 sensor 1. (bank 1 sensor 2 is threaded into the rear of the rear catalytic converter. in order for the car (more specifically the computer) to refine how well the engine will run, and also to keep the amount of pollutants headed out the tailpipe down as low as possible [especially carbon monoxide (CO), hydrocarbons (HC), and oxides of nitrogen (NOx)], the computer constantly compares the two (in this case) oxygen sensor readings (while the engine & computer are running "closed loop") and alters/tweaks/maintains fuel, ignition timing, spark, cooling fans, etc., in order to maximize efficiency. i just googled "oxygen sensor info," and this is the first website i saw http://mr2.com/TEXT/O2_Sensor.html ; it might give you a little more background theory about O2 sensors and how they work, in case you're interested. my idea is that if you understand how they work, why they work, and how to test them, you won't throw away money replacing parts that don't need replacing. good luck. The 2000 Subaru Outback has 2 oxygen sensors. One is located at the front of the catatlytic converter, and the second is at the rear of the catalytic converter. My best guess is #1 is at the front, but I'm not positive here. I'm replacing both anyway as I'm at 100K miles. David

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