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What is your question?
'03 Ford Ranger, all maintenance has been kept up to date. Check engine light came on ~ 1 month ago. Local mechanic changed the oxygen sensor upstream. Was fine for 1 day, then light came back on. Took to AAMCO and they read 2 codes, P0172 & P0176. They said it is running rich. Engine seems to be running fine, no rough idle or anything. Any ideas what is causing this?
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