Codes 0171 and 0174 | Ford Explorer - Ford Ranger Forums - Serious Explorations

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Codes 0171 and 0174

fjord

Member
Joined
September 29, 2012
Messages
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City, State
Fort Smith, Arkansas
Year, Model & Trim Level
1999 Explorer 4.0 V6 OHV
Getting codes 0171 and 0174 on my 1999 Ford Explorer with 4.0 V6 OHV with 136k miles. I cannot detect that the engine is running bad or any different than it has been.

This appears to be a cold weather related issue as this same thing happened last fall and intermittently throughout the winter. I would check something and reset the code but it would eventually come back on. When the weather warmed up the codes did not come back. I figured that maybe cleaning and checking the hoses had fixed it. So...no codes over the summer at all. Now with the weather turning cold again i start getting the codes again.

Wondering if anyone else has experienced this or has any ideas?
 
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koda2000

Explorer Addict
Joined
September 2, 2011
Messages
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Year, Model & Trim Level
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You need to replace your intake manifold gaskets. They leak when it gets colder out and stop/don't leak as much when it's warmer out.
 
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