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Stock 1995 - 2001 Explorers Questions related to non-modified 1995-2001 Explorer, Mountaineer, Ranger and '02+ Sports and Sport Trac. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications.

2000 ranger lean bank 1

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Old 11-10-2012, 06:08 PM   #1
2003, 2000
Join Date: Jan 2010
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2000 ranger lean bank 1

I've done many searches previously for a lean bank 2 problem. I found a vacuum leak at the upper intake manifold, so I replaced the gaskets. Cool, cel went off for a while and then came back on with p0171 code. I read that this is lean bank 1, I couldn't find any vacuum leaks this time so I cleaned the maf and iacv, no dice. What could be causing this? Could it be o2 sensors, should I check fuel pressure, or...? Is there a way to check the o2 sensors?
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