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2010 Forester XT Limited automatic
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Discussion Starter · #1 ·
To level set everybody...complete novice with my Subaru.

So...had the check engine light, cruise control and traction control lights come on today. Stopped by the oreilly down the street and had it coded. Got the lovely P2097 error code(gas mileage has dropped by 2 miles per gallon). So...started poking around under the hood, but didn't jack it up at all to look underneath due to daylight and rain. Pulled the front plastic housing off in front of the air filter to take a peek. Had a coworker tell me that his was located in this area for his '09, so I thought I'd take a look. To my surprise, the O2 sensor was nowhere to be found. So...my question is...where the heck are the upstream and downstream O2 sensors located on a 2010 XT Limited?
 

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2009 Forester XT
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Underneath. Upstream is near the passenger header or possibly up pipe to turbo, downstream on the downpipe, approx middle of car. My 09xt has bright yellow wire loom on both of them.

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2009 Forester XT
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Also, I think your friend may have been referring to the Mass air sensor by the filter. It is a small electrical connection after the filter. You can use mass air cleaner available at Auto stores, remove sensor and gently spray down. I've had plenty of behavioral changes caused by dirty mass air, plus a good time to replace filter if you haven't recently

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2010 Forester XT Limited automatic
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Discussion Starter · #5 ·
When replacing the O2 sensors...was going to pick up the Denso 234-9120 for upstream and Bosch 15730 for the downstream. Does that sound correct?
 

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2009 Forester XT
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The best (perhaps pricier) solution is Subaru OEM replacement for reliability, but I wouldn't go throwing money at parts unless problem is diagnosed to conclusion.
Edit - sorry, didn't answer your question...I'm not familiar with the part numbers.
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