{"id":37150,"date":"2016-11-04T08:31:56","date_gmt":"2016-11-04T13:31:56","guid":{"rendered":"http:\/\/www.freeautomechanic.com\/mechanic\/forum\/?p=37150"},"modified":"2016-11-04T08:31:56","modified_gmt":"2016-11-04T13:31:56","slug":"code-p0171-1999-ford-explorer-4-0","status":"publish","type":"post","link":"https:\/\/www.freeautomechanic.com\/mechanic\/forum\/2016\/11\/code-p0171-1999-ford-explorer-4-0","title":{"rendered":"Code p0171 1999 Ford Explorer 4.0"},"content":{"rendered":"

\"1999hey, I’m throwing code p0171 on my 1999 Ford Explorer 4.0 EFI. So I looked it up and did a few things. I cleaned the MAF sensor<\/a> and replaced the air filter, that did not keep code out. So I replaced the oxygen sensor on bank 1. Not sure where else to look. I do know that the engine seems to be running fine however it is using a little more gas then normal. I do know that my fuel neck needs to be replaced because after we replaced the oxygen sensor on bank 1 it threw a code for large evap leak and whenever your standing back by the fuel cap you can smell a little fuel vapors. Can the fuel neck be causing the computer to throw a p0171 code?<\/p>\n

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RESPONSE<\/p>\n

No.<\/p>\n

Most likely reason for code P0171 would be an intake leak. The intake gaskets are little rubber o-ring style gaskets. It is common for them to fail at this age.<\/p>\n

Ford Code P0171\u00a0 – Fuel Injection System Too Lean Bank 1<\/h3>\n

Ford Code P0171 Possible causes<\/h4>\n