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Originally Posted by 1953drtelco
Just purchased my Ranger last week at an auction. Decided to do the normal maintenance, oil change, air filter etc. Approx 1 hours after changing the air filter I see a check engine light. Scanner showed P0171 code....System too lean bank 1.....idle is perfect so not concerned with a vacuum leak. Will clean the MAF sensor tonight, but will also be checking real time stats later on the O2 sensors. Any other items I should check??
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Just a quick update. Still seeing the same codes which point to oxygen sensor bank 1. Replaced all 3 oxygen sensors (Upstream and Down) but still see the same error codes. Another owner claimed it was a possible cylinder head issue, since ford outsourced the heads to the Soviet Union. sounds like a good story, but unable to validate. Any ideas of what the problem could be? I have to get the smog check next month, and with the engine light on it will not pass. I've removed the error code with my scanner, but the code will come back on within a few minutes. I also know it's not an intake leak as I've sprayed every component and all areas with starter fluid, and no change of idle....????