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2000 ranger lean bank 1

stren_g

Member
Joined
January 10, 2010
Messages
12
Reaction score
0
City, State
ne
Year, Model & Trim Level
2003, 2000
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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