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post #1 of 2 (permalink) Old 12-31-09, 01:32 PM Thread Starter
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00' Explorer O2 sensor which ones?

My check engine light has been on for awhile and I just got around to taking to Advance Auto and they checked the codes. Popped P0171 and P0174, says Bank 1 and 2 running lean. Question is, which ones are they, the ones upstream or downstream. Seeing as they are running about $60.00 each and there are 4, I'd kinda like to know which ones are the culprits. Any help would be appreciated.

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post #2 of 2 (permalink) Old 12-31-09, 05:36 PM
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Re: 00' Explorer O2 sensor which ones?

In most bases when you get those codes together, there's a vacuum leak. Intake gaskets or bolts will cause that.

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