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2007+ Expedition & Navigator 2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator

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Old 02-27-2009, 11:34 AM
rbarbot2 rbarbot2 is offline
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Forgot to connect Mass Air Flow connector - Whoops!

So, I changed my air filter yesterday.

Unfortunately, forgot to reconnect the Mass Air Flow connector before starting the engine. The Check Engine light and the "limp-mode" wrench lamp quickly came on to alert me that I had forgotten something. I reconnected the sensor and the wrench lamp went out but the check engine lamp is still on.

Am I going to need to get the lamp reset at the dealer? The manual indicates that the OBD-II sytem will clear some errors after 3 cold start cycles of driving the vehicle in mixed city/highway. Anyone have any thoughts on this?
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Old 02-27-2009, 12:59 PM
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function12 function12 is offline
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Did you try disconnecting the battery for 5-10 minutes?
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Old 02-27-2009, 03:45 PM
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I was going to suggest disconnecting the battery too. Maybe 20 minutes.
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Old 02-28-2009, 09:08 AM
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Depending on how that particular sensor is coded, something like that usually will go away after 3-5 key cycles of the ignition. The Batt trick works on soft codes that don't store, but hard codes will stay usually until the ECM sees the correct information after a certian number of key cycles or the hard code gets stored until it is cleared by a code scanner.
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Old 03-02-2009, 01:28 PM
rbarbot2 rbarbot2 is offline
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I avoided disconnecting the battery because I was curious whether the light would clear on it's own.

Good news:

After the 3rd morning of cold starting the vehicle, the Check Engine light went out.

Thanks for the tips.
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Old 03-02-2009, 01:28 PM
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